Crystal Space is an Open Source 3D SDK for Unix, Windows, and MacOS/X. It renders with OpenGL and features GLSL shaders, CG shaders, deferred rendering, dynamic shadows, bullet based physics library, terrain engine, skeleton based animation meshes, exporter for Blender, portals, etc...
Win32::DirectX is a Win32 platform native interface to DirectX for Perl. It provides a simple object-oriented interface to the DirectX API, with support for 3d graphics, sound and device input.
The Open Descent Foundation (ODF) is a community for developers, who want to help to create open source programs, tools, etc. for the famous games Descent1, -2 or -3. Everyone can join the ODF if he accepts the idea of writing open source programs.
World Foundry is a 3D level game engine and asset production pathway with over 170,000 lines of code. Originally a commercial product, now released under the GPL. Designed from the beginning to be cross-platform, runs on windows, working on linux port.
spyGLass is an OpenGL call tracer and debugger. It goes a step further than simply using ltrace because it knows what the arguments to the various gl* calls are, and it also knows about OpenGL's error flag.
Falconer-Try Studios is developing this new gaming engine for 2D, 3D and soon VR environments. It will be best for RTS and FPS games. See the documentation for more data.
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