Free GIS Tools Directory — 200+ Online Tools

Free GIS Tool Directory

The definitive reference of open-source geospatial software, organized by user type and category. 200+ tools across 16 categories — desktop GIS, CLI tools, libraries, databases, web maps, and more.

1. Desktop GIS (GUI Tools)
2. Command-line GIS Tools
3. Geospatial Libraries & SDKs
4. Spatial Databases & Engines
5. Web Map Engines & Visualization
6. GIS Servers & APIs
7. Tile Tools
8. Routing Engines
9. Geocoding Engines
10. Remote Sensing & Image Processing
11. Point Cloud & 3D Processing
12. Mobile Data Collection
13. Spatial Data Science & Big Data
14. Data Catalogs & Metadata
15. QGIS Ecosystem — Selected Plugins
16. GIS Format Conversion Matrix

1. Desktop GIS (GUI Tools)

For GIS analysts, planners, environmental scientists, and other non-developers who need daily geospatial tools.

Full-featured Desktop GIS

Tool	Description	Platform	Status	Link
QGIS	The leading open-source desktop GIS, feature-rich comparable to ArcGIS. Supports 100+ vector/raster formats, 3D view, Python plugin system, 500+ community plugins	Win/Mac/Linux	✅ Active	qgis.org
gvSIG Desktop	Mature desktop GIS popular in Spanish-speaking regions and public administration. Supports vector/raster editing, network analysis, CRS transformation	Win/Linux	⚠️ Maintenance	gvsig.com
OpenJump	Lightweight Java desktop GIS with fast startup. Good at vector editing, topology processing, SQL queries	Win/Mac/Linux	⚠️ Low activity	openjump.org
uDig	Eclipse-based desktop GIS for users who need Java IDE integration	Win/Mac/Linux	⛔ Stalled	udig.refractions.net
SAGA GIS	Designed for geoscientific research with 600+ raster/vector/terrain analysis modules. Academic-oriented UI	Win/Linux	✅ Active	saga-gis.sourceforge.io
GRASS GIS	The oldest open-source GIS (40+ years). Extremely powerful raster/vector/terrain analysis engine. Usable via QGIS plugin	Win/Mac/Linux	✅ Active	grass.osgeo.org
WhiteboxTools (GUI)	Cross-platform desktop app with 500+ geospatial analysis tools, developed at University of Guelph	Win/Mac/Linux	✅ Active	whiteboxgeo.com

Spatial Data Analysis & Statistics

Tool	Description	Platform	Status	Link
GeoDa	Spatial statistical analysis and visualization, focused on spatial autocorrelation, clustering, regression	Win/Mac/Linux	✅ Active	geodacenter.github.io
Cartographica	Native macOS GIS, lightweight yet fully featured	Mac	⚠️ Niche	cartographica.com

3D Earth & Terrain Visualization

Tool	Description	Platform	Status	Link
CesiumJS	3D Earth/map Web library with GPU acceleration, supports 3D Tiles, terrain, time dynamics	Web	✅ Active	cesium.com/platform/cesiumjs
NASA WorldWind	NASA’s 3D Earth SDK with Java/Web versions	Win/Mac/Linux/Web	⚠️ Low activity	worldwind.arc.nasa.gov

2. Command-line GIS Tools

For data engineers, DevOps, and developers who need batch processing and automation.

Format Conversion & Processing

Tool	Description	Language	Link
GDAL/OGR	The “Swiss Army knife” of open-source GIS. Read/write 200+ raster formats and 100+ vector formats, spatial analysis, projection conversion	C/C++ (CLI)	gdal.org
osmium-tool	High-speed OSM PBF data processor for area extraction, tag filtering, format conversion	C++ (CLI)	osmcode.org/osmium-tool
OsmConvert	OSM PBF ↔ OSM XML format converter, old but stable	C (CLI)	wiki.openstreetmap.org
mapshaper	Lightweight vector simplification/ conversion tool. Supports Shapefile/GeoJSON/TopoJSON simplification, clipping, format conversion	Node.js (CLI+Web)	github.com/mbloch/mapshaper
ogr2ogr	GDAL’s primary vector format conversion command. Supports virtually all vector format interconversion	C/C++ (CLI)	Ships with GDAL
gdal_translate	GDAL’s raster format conversion command. Supports GeoTIFF/COG/MBTiles and more	C/C++ (CLI)	Ships with GDAL
gdalwarp	GDAL’s raster reprojection/cropping/mosaicking command	C/C++ (CLI)	Ships with GDAL
gdalbuildvrt	GDAL’s virtual raster mosaicking tool. Combines multiple raster files into one VRT	C/C++ (CLI)	Ships with GDAL
gdal_contour	Generate contour lines from DEM	C/C++ (CLI)	Ships with GDAL

Coordinate Reference Systems

Tool	Description	Language	Link
PROJ	Coordinate transformation library and CLI (cs2cs, proj, cct, geod). Supports thousands of CRS	C/C++ (CLI)	proj.org
gdaltransform	GDAL’s coordinate transformation CLI for batch file conversion	C/C++ (CLI)	Ships with GDAL
Cartographic Projections (pyproj)	Python bindings for PROJ. CLI via `proj` and related tools	Python	pyproj4.github.io

Tile Tools (CLI)

Tool	Description	Language	Link
Tippecanoe	Convert large GeoJSON/CSV datasets to MVT vector tiles (MBTiles/PMTiles) with level-of-detail simplification	C++ (CLI)	github.com/felt/tippecanoe
Tilemaker	Generate vector tiles (MBTiles) directly from OSM PBF with Lua-configurable styles	Lua/C++ (CLI)	tilemaker.org
Planetiler	Ultra-fast vector tile generation from global OSM data. Java implementation, memory-efficient	Java (CLI)	github.com/onthegomap/planetiler
Tilemaker (v2)	Newer version of tilemaker with performance improvements and flexible styling	Lua/C++ (CLI)	Same as above
MBUtil	MBTiles import/export/management tool	Python (CLI)	github.com/mapbox/mbutil
PMTiles CLI	Create, inspect, and merge PMTiles format	Go	github.com/protomaps/go-pmtiles
gdal2tiles	Generate Web map tiles (raster tiles) using GDAL	Python (CLI)	Ships with GDAL
gdal2xyz	Export raster DEM to XYZ point cloud	C/C++ (CLI)	Ships with GDAL

Terrain / Elevation Tools

Tool	Description	Language	Link
gdaldem	Generate hillshade, slope, aspect, and color relief from DEM	C/C++ (CLI)	Ships with GDAL
pdal	Point cloud processing, filtering, and conversion CLI. Like GDAL but for LAS/LAZ	C++ (CLI)	pdal.io
ctb-tile	Cesium Terrain Builder — Generate Cesium quantized-mesh terrain tiles from DEM	C++ (CLI)	github.com/geo-data/cesium-terrain-builder
dem-tools	Various DEM processing script collections	Python	Multiple independent projects
Erosion Threads	Terrain flow erosion simulation CLI	C++ (CLI)	github.com/erosion-threads

OSM Data Processing

Tool	Description	Language	Link
osmium-tool	See above — the go-to OSM PBF processing tool	C++ (CLI)	osmcode.org/osmium-tool
osmfilter	Filter OSM data by tag conditions	C (CLI)	wiki.openstreetmap.org
Overpass API (CLI)	Query OSM data via Overpass QL	-	overpass-api.de
Osmium (Python)	Python bindings for osmium	Python	docs.osmcode.org/pyosmium

3. Geospatial Libraries & SDKs

For developers building geospatial applications.

C/C++ Core Libraries

Library	Description	Link
GDAL	Vector/raster data abstraction layer. The foundation stone of virtually all GIS tools	gdal.org
GEOS	Geometry engine implementing OGC Simple Features standard. Foundation of PostGIS/Shapely/QGIS	libgeos.org
PROJ	Coordinate projection/transformation library	proj.org
SFCGAL	Extends GEOS with 3D geometry operations and advanced spatial SQL support	oslandia.github.io/SFCGAL

Java Libraries

Library	Description	Link
JTS Topology Suite	Java geometry operations library. The Java-native equivalent of GEOS	github.com/locationtech/jts
GeoTools	Java GIS toolkit. Foundation of GeoServer, supports OGC standards	geotools.org
H2GIS	Spatial extension for H2 database	h2gis.org

Python Ecosystem

Library	Description	Link
Shapely	Geometry operations library (Python bindings for GEOS). Create geometries, spatial relationship checks, buffers	shapely.readthedocs.io
Fiona	Vector data read/write (Python bindings for OGR). Supports Shapefile/GeoJSON/KML and more	fiona.readthedocs.io
Rasterio	Raster data read/write (Python bindings for GDAL). Modern Pythonic API	rasterio.readthedocs.io
GeoPandas	Extends Pandas for geospatial data. Built on Shapely+Fiona+Matplotlib. DataFrame operations on spatial data	geopandas.org
Pyproj	Python bindings for PROJ. Coordinate transformations	pyproj4.github.io
Cartopy	Map making with support for various projections and map elements	scitools.org.uk/cartopy
Folium	Python wrapper for Leaflet. Quickly create interactive maps	python-visualization.github.io/folium
PyQGIS	QGIS Python API for scripting and plugin development	qgis.org/pyqgis
contextily	Utility to fetch basemaps from Web tile services	github.com/geopandas/contextily
geopy	Geocoding (address → coordinates) and various distance calculations	geopy.readthedocs.io
xarray-spatial	xarray-based raster analysis with GPU acceleration support	xarray-spatial.org
rioxarray	Rasterio + xarray for convenient raster data science	corteva.github.io/rioxarray
osmnx	Automatically download OSM street networks and urban morphology data for network analysis	osmnx.readthedocs.io
leafmap	Low-code interactive map visualization integrating multiple data sources	leafmap.org
WhiteboxTools (Python)	Python interface for WhiteboxTools	whiteboxgeo.com

JavaScript / TypeScript Ecosystem

Library	Description	Link
Turf.js	Spatial analysis library for browser/Node.js. Supports buffers, intersections, unions, distance calculations	turfjs.org
Leaflet	Lightweight Web map library with rich plugin ecosystem (3000+ plugins)	leafletjs.com
OpenLayers	Full-featured Web map library with vector tile and multi-source support	openlayers.org
MapLibre GL JS	WebGL-accelerated Web map library. Open-source fork of Mapbox GL JS with 3D terrain support	maplibre.org
CesiumJS	3D Earth/map Web library	cesium.com/platform/cesiumjs
deck.gl	WebGL-powered data visualization framework from Uber. Renders millions of data points	deck.gl
Kepler.gl	WebGL data visualization tool from Uber. No-code drag-and-drop	kepler.gl
L7 (AntV)	Large-scale geospatial visualization engine by Ant Group	github.com/antvis/L7
Tangram	Real-time Web 3D map rendering engine	github.com/tangrams/tangram
Mapbox GL Native	Native Mapbox GL for Android/iOS/macOS/Windows	github.com/maplibre/maplibre-native

R Language Ecosystem

Library	Description	Link
sf	Standard vector data processing package for R	r-spatial.github.io/sf
raster / terra	Raster data processing for R	rspatial.org/terra
leaflet (R)	Leaflet interface for R	rstudio.github.io/leaflet
tmap	Create high-quality thematic maps in R	r-tmap.github.io/tmap
mapsf	Cartography and spatial data visualization for R	riatelab.github.io/mapsf
osrm (R)	OSRM interface for R	github.com/rCarto/osrm

Go Ecosystem

Library	Description	Link
go-pmtiles	Go implementation of PMTiles	github.com/protomaps/go-pmtiles
go-geom	Geometry operations library for Go	github.com/twpayne/go-geom
goteo	High-precision geometry computation for Go	github.com/twpayne/goteo

Rust Ecosystem

Library	Description	Link
geo	Core geometry library for Rust	github.com/georust/geo
gdal (Rust)	Rust bindings for GDAL	github.com/georust/gdal
flatgeobuf (Rust)	Rust implementation of FlatGeobuf format	github.com/flatgeobuf/flatgeobuf

4. Spatial Databases & Engines

Tool	Description	Type	Link
PostGIS	PostgreSQL spatial extension. The most mature open-source spatial database with full OGC standard support	Database extension	postgis.net
SpatiaLite	Spatial extension for SQLite. Suitable for mobile/lightweight deployments, no separate server needed	Database extension	gaia-gis.it
DuckDB Spatial	Spatial extension for embedded OLAP database. Columnar storage, ideal for large-scale spatial analysis	Database extension	duckdb.org/docs/extensions/spatial
GeoPackage	Open spatial data format standard based on SQLite. Stores vector + raster + metadata	Format/Database	geopackage.org
GeoMesa	Spatial indexing and time-series storage for Accumulo/HBase/Cassandra/Kafka	Big data	geomesa.org
H2GIS	Spatial extension for H2 database	Database extension	h2gis.org
pgRouting	Routing extension for PostGIS. Shortest path, TSP, parking, and more	Database extension	pgrouting.org
MobilityDB	Moving object extension for PostGIS. Trajectory data storage and analysis	Database extension	mobilitydb.com
3DCityDB	3D city model database. Store/manage CityGML data	Database extension	3dcitydb.net

5. Web Map Engines & Visualization

Frontend Rendering Engines

Tool	Description	Rendering	Link
MapLibre GL JS	WebGL vector tile rendering. 3D buildings/terrain. Open-source successor to Mapbox GL	GPU (WebGL)	maplibre.org
OpenLayers	Full-featured 2D Web map library supporting various data sources and OGC standards	Canvas/WebGL	openlayers.org
Leaflet	The lightest and most popular 2D Web map library with 3000+ plugins	Canvas/DOM	leafletjs.com
CesiumJS	3D Earth/map Web library. GPU-accelerated, supports 3D Tiles and terrain	GPU (WebGL)	cesium.com/platform/cesiumjs
deck.gl	Uber’s WebGL data visualization framework. Millions of data points	GPU (WebGL)	deck.gl
Kepler.gl	Uber’s WebGL data visualization tool. No-code drag-and-drop	GPU (WebGL)	kepler.gl
L7 (AntV)	Large-scale geospatial visualization engine by Ant Group	GPU (WebGL)	github.com/antvis/L7
Tangram	Real-time Web 3D map rendering engine	WebGL	github.com/tangrams/tangram
Mapbox GL Native	Native Mapbox GL for Android/iOS/macOS/Windows	GPU	github.com/maplibre/maplibre-native

No-Code / Low-Code Map Tools

Tool	Description	Link
Kepler.gl	Uber’s drag-and-drop data visualization tool supporting big data and animation	kepler.gl
GeoDataViewer	Browser-based drag-and-drop GIS viewer (Shapefile/GeoJSON/KML/PMTiles etc.), MapLibre rendering	geodataviewer.com
MapTiler	Map hosting + style editor with free tier	maptiler.com

6. GIS Servers & APIs

Map Tile / Feature Services

Tool	Description	Language	Link
GeoServer	The most popular open-source map server. Supports WMS/WFS/WCS/WMTS with Web management UI	Java	geoserver.org
MapServer	Veteran C-language map server. High performance, Mapfile-based configuration	C	mapserver.org
QGIS Server	Map server based on QGIS project files. WYSIWYG configuration	C++/Python	qgis.org
deegree	Comprehensive SDI (Spatial Data Infrastructure) software. WMS/WFS/WCS/WPS	Java	deegree.org
MapProxy	Tile cache/proxy/WMS accelerator supporting multiple source aggregation	Python	mapproxy.org

Lightweight Tile Services

Tool	Description	Language	Link
Martin	Ultra-lightweight PostGIS → MVT vector tile server. Simple configuration	Rust	maplibre.org/martin
pg_tileserv	Crunchy Data’s PostGIS vector tile service. SQL as a service	Go	github.com/CrunchyData/pg_tileserv
pg_featureserv	Crunchy Data’s PostGIS feature service. OGC API Features	Go	github.com/CrunchyData/pg_featureserv
t-rex	PostGIS → MVT vector tile generation and service	Rust	t-rex.tileserver.com
TileServer GL	Serve MapLibre GL styled tiles from MBTiles/PMTiles	Node.js	github.com/maplibre/tileserver-gl
TileServer PHP	Lightweight PHP tile server supporting MBTiles	PHP	github.com/maptiler/tileserver-php
OpenTileServer	One-click deploy open-source tile server collection	Docker	opentileserver.org

OGC API Services

Tool	Description	Language	Link
pygeoapi	Python service framework implementing OGC API standards (Features/Tiles/Coverages/etc.)	Python	pygeoapi.io
GeoNetwork	Spatial metadata catalog management system (ISO 19115/19119)	Java	geonetwork-opensource.org
CKAN (geospatial)	Open-source data portal platform with spatial data extension support	Python	ckan.org
STAC (SpatioTemporal Asset Catalogs)	Spatiotemporal asset catalog specification and implementations	Multi-language	stacspec.org
pygeoapi-stac	STAC extension for pygeoapi	Python	pygeoapi

Tile Cache / CDN

Tool	Description	Language	Link
MapProxy	Professional WMS/tile cache proxy	Python	mapproxy.org
TileCache	Lightweight tile cache server	Python	tilecache.org

7. Tile Tools

Vector Tile Creation

Tool	Description	Language	Link
Tippecanoe	Generate MVT vector tiles (MBTiles/PMTiles) from large GeoJSON/CSV datasets	C++	github.com/felt/tippecanoe
Tilemaker	Generate vector tiles from OSM PBF with Lua-configurable styles	C++	tilemaker.org
Planetiler	Generate global vector tiles from OSM PBF quickly	Java	github.com/onthegomap/planetiler
OpenMapTiles	Complete OSM → vector tile toolchain with map style generation	Multi	openmaptiles.org
Mapbox Studio (CLI)	Mapbox vector tile style tools (free tier has limitations)	Node.js	mapbox.com
Baremaps	Java ecosystem OSM vector tile pipeline	Java	baremaps.org

Raster Tile Creation

Tool	Description	Language	Link
gdal2tiles.py	GDAL utility. Generate Web Mercator raster tiles from raster files	Python	Ships with GDAL
MapTiler Engine	Desktop GUI tool for raster/vector tile creation (free tier limited)	C++	maptiler.com
Kosmos Tile Generator	Mapnik-based tile generator	Python	github.com/kosmtik/kosmtik

Terrain Tiles

Tool	Description	Language	Link
Re:Earth Terrain	Real-time DEM + EGM2008 geoid fusion into Cesium/MapLibre terrain tiles	TypeScript (Worker)	terrain.reearth.land
Cesium Terrain Builder	Generate Cesium quantized-mesh terrain tiles from DEM	C++	github.com/geo-data/cesium-terrain-builder
terrarium	Generate Mapzen Terrarium-encoded terrain RGB tiles from DEM	Python	github.com/geotiff/terrarium

Tile Formats

Format	Description	Typical Toolchain
MBTiles	SQLite database containing tiles. Suitable for offline maps	Tippecanoe → TileServer GL
PMTiles	Single-file tile format. Direct browser requests, no server needed	Tippecanoe/Planetiler → Browser
MVT	Mapbox Vector Tile standard	Tippecanoe/PostGIS → MapLibre/OpenLayers
GeoPackage	OGC standard with tile support (WIP)	GDAL → QGIS
COG (Cloud Optimized GeoTIFF)	Cloud-optimized GeoTIFF. Direct HTTP Range reads	gdal_translate → Browser/MapLibre

8. Routing Engines

Engine	Description	Language	Performance	Link
OSRM	Open Source Routing Machine. C++ implementation,极致性能，专为 OSM 优化	C++	⚡ Very Fast	project-osrm.org
GraphHopper	Java routing engine supporting multiple transport modes. Enterprise-grade	Java	🚀 Fast	graphhopper.com
Valhalla	Open-source routing engine with multi-modal, time/distance matrix, isolines	C++	🚀 Fast	valhalla.github.io
pgRouting	PostGIS extension. SQL-based routing analysis. Flexible but slower than dedicated engines	C/SQL	Medium	pgrouting.org
OpenTripPlanner	Multi-modal travel planning (transit + walking + bike + train) with GTFS data	Java	Medium	opentripplanner.org
BRouter	Bike/hiking dedicated routing engine	Java	Medium	brouter.de
Routino	Lightweight routing engine, suitable for embedded systems	C	Fast	routino.org

9. Geocoding Engines

Engine	Description	Language	Data Size	Link
Nominatim	Official OSM geocoding engine. Full forward/reverse support	C++/Python	Large (full OSM)	nominatim.org
Photon	Elasticsearch-based lightweight geocoding. Fast with fuzzy search support	Java	Large	photon.komoot.com
Pelias	Elasticsearch-based modular geocoder with multi-source support	Node.js	Large	pelias.io
geocoder (Python)	Unified Python interface for multiple geocoding services	Python	N/A	geocoder.readthedocs.io
geopy	Python geocoding library supporting Nominatim/Google/Bing and more	Python	N/A	geopy.readthedocs.io

10. Remote Sensing & Image Processing

Full Platforms

Tool	Description	Platform	Link
Orfeo ToolBox (OTB)	Remote sensing image processing platform by CNES (French Space Agency). 500+ processing modules with GUI (Monteverdi) + CLI + Python	Win/Mac/Linux	orfeo-toolbox.org
SNAP (ESA)	ESA’s remote sensing platform designed for Sentinel data	Win/Mac/Linux	step.esa.int
GRASS GIS	Powerful raster/image processing engine with classification, filtering, change detection	Win/Mac/Linux	grass.osgeo.org
Opticks	Extensible remote sensing image analysis platform	Win/Linux	opticks.org — ⚠️ May be inactive

Python Remote Sensing Libraries

Library	Description	Link
Rasterio	Raster data read/write with modern Python API	rasterio.readthedocs.io
rioxarray	Rasterio + xarray for multidimensional raster data	corteva.github.io/rioxarray
Satpy	Satellite data reading and processing (GOES/JPSS etc.)	satpy.readthedocs.io
eo-learn	Earth Observation data processing workflow framework, seamless Sentinel Hub integration	eo-learn.readthedocs.io
PyTroll	Meteorological satellite data processing toolkit	pytroll.github.io
TorchGeo	PyTorch remote sensing data loaders and deep learning tools	torchgeo.readthedocs.io
OpenCV	General computer vision library used in remote sensing for image registration, segmentation, etc.	opencv.org
scikit-image	Python image processing library	scikit-image.org
segment-geospatial	Geospatial image segmentation library based on SAM	github.com/opengeos/segment-geospatial
Sarsen	Sentinel-1 SAR data processing for Python	github.com/andrawn/sarsen

InSAR (Interferometric Synthetic Aperture Radar)

Tool	Description	Link
GMTSAR	InSAR processing system based on GMT	topex.ucsd.edu/gmtsar
LiCSBAS	InSAR time-series analysis based on LiCSAR products	github.com/yumorishita/LiCSBAS
PyRate	InSAR time-series velocity estimation	github.com/GeoscienceAustralia/PyRate
ISCE	InSAR Scientific Computing Environment — open-source InSAR processing framework	github.com/isce-framework/isce3

Photogrammetry

Tool	Description	Link
OpenDroneMap / ODM	Drone imagery → orthophoto/DSM/point cloud/3D model pipeline	opendronemap.org
MicMac	Photogrammetry tool by French IGN	micmac.ensg.eu
Meshroom	AliceVision-based 3D reconstruction GUI	alicevision.org
COLMAP	SfM/MVS 3D reconstruction pipeline	colmap.github.io

11. Point Cloud & 3D Processing

Point Cloud Processing

Tool	Description	Platform/Language	Link
PDAL	Point cloud processing library (GDAL for point clouds). Supports LAS/LAZ/COPC/EPT	C++ (CLI+API)	pdal.io
CloudCompare	3D point cloud/triangle mesh processing and comparison software, GUI + CLI	Win/Mac/Linux	cloudcompare.org
Entwine	Massive point cloud organization/indexing with Cesium 3D Tiles output	C++ (CLI)	entwine.io
Potree	WebGL large point cloud visualization renderer	Web (JS)	potree.github.io
Open3D	3D data processing library for Python/C++. Point cloud registration/segmentation/reconstruction	Python/C++	open3d.org
PDAL (Python)	Python bindings for PDAL	Python	Ships with PDAL
lastools	LAS toolset (partially open-source: las2las/las2txt etc. CLI tools)	C++ (CLI)	github.com/LAStools/LAStools
WhiteboxTools	500+ tools including point cloud classification, DEM generation	CLI/Python	whiteboxgeo.com

3D Tiles

Tool	Description	Link
Cesium 3D Tiles	Streaming 3D data standard with native CesiumJS support	github.com/CesiumGS/3d-tiles
py3dtiles	Python 3D Tiles library for generating/processing 3D Tiles	github.com/Oslandia/py3dtiles
3d-tiles-tools	Cesium’s official 3D Tiles toolset	github.com/CesiumGS/3d-tiles-tools
Entwine	Best entry point for point cloud → 3D Tiles	entwine.io

12. Mobile Data Collection

Tool	Description	Platform	Link
QField	Leading open-source mobile GIS with deep QGIS integration. Offline, GPS, forms	Android/iOS	qfield.org
Mergin Maps (Input)	QGIS-based mobile data collection with cloud sync service	Android/iOS	merginmaps.com
ODK (Open Data Kit)	Universal mobile data collection framework with geospatial fields	Android	getodk.org
KoboToolbox	Humanitarian data collection platform based on ODK	Web/Android	kobotoolbox.org
GeoODK	Spatially-enhanced version of ODK	Android	geoodk.com
Organic Maps	Offline map navigation with POI and track recording	Android/iOS	organicmaps.app

13. Spatial Data Science & Big Data

Python Data Science Ecosystem (key tools grouped together)

GeoPandas — Spatial DataFrame operations
Shapely — Geometry operations
Kepler.gl (Python) — Big data visualization in Jupyter
Leafmap — Low-code spatial analysis
Xarray-spatial — Large-scale raster analysis
OSMnx — OSM urban network analysis

Distributed Computing

Framework	Description	Ecosystem	Link
Apache Sedona	Spatial big data analytics framework for Spark. Supports Java/Scala/Python/SQL	Spark	sedona.apache.org
GeoMesa	Large-scale spatiotemporal indexing and querying for multiple NoSQL stores	Accumulo/HBase/Cassandra	geomesa.org
GeoTrellis	Raster/vector big data processing framework based on Spark	Spark	geotrellis.io
Spatial Hadoop	Spatial extension for Hadoop MapReduce	Hadoop	github.com/ASUSpace/Spatial-Hadoop (niche)
Dask-GeoPandas	Parallelized GeoPandas via Dask	Python/Dask	github.com/geopandas/dask-geopandas

Spatial Indexing

Library	Description	Link
H3	Uber’s hexagonal hierarchical grid index (Python/JS/Java/Go etc.)	h3geo.org
S2 Geometry	Google’s spherical geometry index library (S2 cells)	s2geometry.io
Geohash	Z-order curve spatial encoding	Multi-language implementations
RTree / libspatialindex	R-tree spatial index library	libspatialindex.org

14. Data Catalogs & Metadata

Tool	Description	Language	Link
GeoNetwork	Spatial data catalog with ISO 19115/19119 standard support and Web editor	Java	geonetwork-opensource.org
CKAN + ckanext-spatial	General data portal + spatial extension	Python	ckan.org
pygeoapi	Lightweight data catalog implementing OGC API — Records standard	Python	pygeoapi.io
STAC	SpatioTemporal Asset Catalogs standard	Multi-language	stacspec.org
STAC Browser	Web frontend browser for STAC catalogs	JS	github.com/radiantearth/stac-browser
Franklin	Lightweight STAC API server	Go	github.com/developmentseed/franklin
Titiler	Dynamic COG/STAC tile serving	Python	github.com/developmentseed/titiler
Stac Index	Global index of STAC catalogs	Web	stacindex.org

15. QGIS Ecosystem — Selected Plugins

Plugin	Description	Category	Link
QuickMapServices	One-click basemap services (OSM/ESRI/Google etc.)	Basemaps	Plugin Manager
OpenLayers Plugin	Preview OpenLayers-supported basemaps in QGIS	Basemaps	Plugin Manager
OSMDownloader	Download OSM data via Overpass API	OSM	Plugin Manager
QuickOSM	Quick OSM data query and download	OSM	Plugin Manager
Orfeo ToolBox (OTB) Plugin	Run OTB remote sensing modules from QGIS	Remote Sensing	Plugin Manager
Processing R Provider	Run R spatial analysis from QGIS	Analysis	Plugin Manager
HFEQS (SAGA)	SAGA GIS processing integration	Analysis	Ships with QGIS
Profile Tool	Terrain profile tool	Terrain	Plugin Manager
qgis2web	QGIS project → Leaflet/OpenLayers Web map	Web	github.com/tomchadwin/qgis2web
Tile+	Raster/vector tile loading and management	Tiles	Plugin Manager
Mergin Maps Plugin	QGIS ↔ Mergin mobile data collection sync	Mobile	Plugin Manager
QFieldSync	QGIS ↔ QField mobile data collection sync	Mobile	Plugin Manager
Data Plotly	Interactive charts in QGIS (scatter, histogram, etc.)	Visualization	Plugin Manager
Time Manager	Temporal animation control	Spatiotemporal	Plugin Manager
LAT / Lizard	Connect to Lizard remote sensing data platform	Remote Sensing	Plugin Manager
OpenTopography DEM Downloader	Download SRTM/ALOS/COP DEM data	Terrain	Plugin Manager
HCMGIS	Chinese geospatial data tools (Baidu/Amap/Tianditu etc.)	China	github.com/hcmgis
Semi-Automatic Classification Plugin	Supervised/unsupervised remote sensing image classification	Remote Sensing	semiautomaticclassificationalgorithm.com
Plugin Builder 3	QGIS plugin development wizard	Development	Plugin Manager
Cadasta	Land tenure and political boundary data	Specialized	Plugin Manager

16. GIS Format Conversion Matrix

From → To	GeoJSON	Shapefile	GeoPackage	KML	GPX	CSV	TopoJSON	GeoParquet	FlatGeobuf
GeoJSON	-	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	mapshaper	mapshaper	ogr2ogr	ogr2ogr
Shapefile	ogr2ogr	-	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	mapshaper	ogr2ogr	ogr2ogr
GeoPackage	ogr2ogr	ogr2ogr	-	ogr2ogr	ogr2ogr	ogr2ogr	mapshaper	ogr2ogr	ogr2ogr
KML	ogr2ogr	ogr2ogr	ogr2ogr	-	ogr2ogr	ogr2ogr	mapshaper	ogr2ogr	ogr2ogr
GPX	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	-	ogr2ogr	mapshaper	ogr2ogr	ogr2ogr
GeoParquet	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	ogr2ogr	mapshaper	-	ogr2ogr
PMTiles → Extract	tippecanoe —output=…	-	-	-	-	-	-	-	-

Tip: Use ogr2ogr for most vector format conversions. Use gdal_translate for raster format conversions. Use mapshaper for format simplification. use mapshaper for JSON/TopoJSON conversions.

Appendix: About OSGeo

The Open Source Geospatial Foundation (OSGeo) is the core organization of the open-source GIS ecosystem. Many of the projects listed above are its formal or incubating projects.

OSGeo Flagship Projects:

GDAL/OGR, QGIS, GRASS GIS, GeoServer, MapServer, PostGIS, PROJ, GeoNetwork, Orfeo ToolBox, OpenLayers, OSGeoLive

OSGeo Community Projects:

PDAL, ZOO-Project, PyWPS, istSOS, Tellus, METEOR

OSGeoLive:

A Linux distribution containing 50+ open-source GIS applications on a single DVD/USB. Try them all without installation.

About This Directory

Written: 2026-06-29

Purpose: Reference for GeoDataViewer’s GIS Tool Directory series

Future: May be published as multi-part series: GUI Tools / CLI Tools / Python Ecosystem / Databases / Web Maps / Tile Tools, etc.

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