Flexible level editor
Make OpenStreetMap vector tiles without the stack
Import OpenStreetMap data into a PostgreSQL/PostGIS database
General purpose tile map editor
Open Source Routing Machine - C++ backend
Minimalistic wide-open GPS-locator/tracker
2D Game Engine
Fast and robust map analyser for Brood War.
Adventure game with permanent death & procedurally generated level.
A tile-based map viewer with support for GPX files.
A roguelike game engine/editor
Just a small Tile map editor