Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
CM Game Development Kit
The CMGDK is an game engine useable in C++11. It is completely cross-platform, using OpenGL Core 3.3(need DSA,VAB) and OpenAL.
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