GLScene Engine for Delphi & C++Builder VCL Windows 32/64
GemRB is a portable open-source implementation of the Infinity Engine
3D modeler, 3D game maker, 3D demo maker
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Zoomable user interface (ZUI) with file manager, file viewers and more
LDraw™ editor for LEGO® style digital building instructions.
Heros of Jin Yong 3D Remastered
Cross-platform real-time strategy game (3D)
functions for 2D/3D graphics + realistic driving simulation
A free 3d game for PC that does not limit the player. Fight,Build,Gain
3D Scene Builder
Vivid3D is an open-source 3D engine with powerful 2D UI.
3rd Party Video Games Developer: MetalManGames, titles of games
3D OpenGL dungeon game using Ada: a tribute to Narbacular Drop
Vivid is a modern C++ 3D engine using OpenGL4+
Go 3D Game Engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
OpenGL port of the classic 6dof 3D shooter Descent
DOOM / Heretic / Hexen source port with enhanced graphics and UI