Odamex is a free, cross-platform, modern client-server Doom engine
Real-time 3D visualization of space
Neo Modding API for Minecraft: Java Edition, based on Forge
A tool to edit profile and saved game files for FasterThanLight.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
XMLTV obtains and processes TV listings data
Open and edit the archive files used in over 5700 games.
xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju
A free sing-along karaoke game for your PC
Ur-Quan Masters High Definition
A simple turn-based artillery game and also a real-time strategy game.
Open source voxel world
Open source model airplane simulator
Air traffic control tower and radar simulator (solo + multi-player)