MySQL - The world's most popular open source database
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
QGIS - QGIS is a desktop geographic information system, or GIS.
SQLite - SQLite Home Page
OpenStreetMap - OpenStreetMap is a map of the world, created by people like you and free to use under an open license.