- PostGIS - Spatial database extender for PostgreSQL
- MongoDB - Document database with geospatial queries support
Tiles & Web
- Awesome Vector Tiles - Curated list of vector tiles resources
- GeoDjango - Django’s geographic web framework
- TileLive - Map tile server and utilities
- Tessela - Lightweight Node.js Mapbox Vector Tiles server
- Tippecanoe - Build vector tilesets from large GeoJSON features
Coordinates
- EPSG.io - Coordinate systems worldwide
- PyProj - Python interface to PROJ (cartographic projections library)
Maps
- Folium - Python data to Leaflet.js maps (works in Jupyter)
Miscellaneous
- WGS 84 (World Geodetic System 1984 : système géodésique mondial, révision de 1984): format standard (EPSG:4326).
- Lambert II : autre système de coordonées, français (EPSG:27572).
Lots of resources: GovHack Toolkit - Geographic Data