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A planetarium software that shows a 3D simulation of the night sky33,639 weekly downloads
Open source FPS/RTS Game364 weekly downloads
Hardcore 3D space shooter with spaceship upgrade possibilities.130 weekly downloads
CM Game Development Kit
Quake 2 Evolved is an advanced engine modification by Team Blur Games.
Tactical Warfare Engine is an Open Source 2.5D Real-Time Strategy game engine made using OpenGL. It aims to be a replacement for the aging StarCraft game engine, but also supports the creation of entirely new RTS games.
hlbsp is an attempt to create a freely available cross platform renderer for the BSP file format of the GoldSrc Engine used by Valve to power HalfLife and its mods.