GemRB is a portable open-source implementation of the Infinity Engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
WW2 U-boat simulation
Hardcore 3D space shooter with spaceship upgrade possibilities.
LDraw™ editor for LEGO® style digital building instructions.
Zoomable user interface (ZUI) with file manager, file viewers and more
Cross-platform real-time strategy game (3D)
An unmodified version of the MMORPG Impressive Title by KovuLKD
functions for 2D/3D graphics + realistic driving simulation
Vivid is a modern C++ 3D engine using OpenGL4+
Cross-breeding a 3D FPS with a fantasy RPG in the world of Hexen
Heros of Jin Yong 3D Remastered
An isometric arcade-style game of skill, puzzles and exploration
3D OpenGL Game [moved to: play.ru.net/tanks3d]
3D OpenGL dungeon game using Ada: a tribute to Narbacular Drop
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Vivid3D is an open-source 3D engine with powerful 2D UI.