C++

QGIS

OSS

Free and open-source cross-platform desktop GIS. Create, edit, visualize, analyze and publish geospatial data.

Alternative to ArcGIS, MapInfo Pro

GDAL

OSS

Translator library for raster and vector geospatial data formats. The Swiss Army knife of GIS.

GRASS GIS

OSS

Free, open-source GIS software for geospatial data management, analysis, and visualization.

Alternative to ArcGIS

FlatGeobuf

OSS

Binary geospatial vector format with fast streaming via HTTP range requests.

MapServer

OSS

Open-source platform for publishing spatial data and interactive maps to the web.

Alternative to ArcGIS

OpenDroneMap

OSS

Open-source CLI for turning aerial imagery into orthophotos, point clouds, DEMs, and 3D models.

OSRM

OSS

High-performance routing engine designed to run on OpenStreetMap data.

Alternative to HERE Technologies, TomTom, Google Maps Platform

osm2pgsql

OSS

Import OpenStreetMap data into a PostgreSQL/PostGIS database for map rendering and analysis.

Osmium

OSS

Fast and flexible C++ library and command-line tool for working with OpenStreetMap data.

PDAL

OSS

Point cloud data abstraction library and CLI for translating, filtering, and processing LiDAR.

pgRouting

OSS

Routing algorithms — Dijkstra, A*, TSP, VRP — as SQL functions inside PostGIS.

Alternative to HERE Technologies, TomTom

Valhalla

OSS

Open-source routing engine with turn-by-turn navigation and isochrone generation.

Alternative to HERE Technologies, TomTom, Google Maps Platform

PROJ

OSS

Generic coordinate transformation library for converting between different CRS.

Tippecanoe

OSS

Build vector tilesets from large collections of GeoJSON features. Essential for tile generation.

Alternative to Mapbox