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.
Ayam is a free 3D modelling environment for the RenderMan interface.
A fast, unobtrusive and modern cross-platform GUI toolkit. Agar fully exploits hardware acceleration where available, but also supports simple frame-buffer interfaces. Agar is stand-alone and easily portable to new platforms and graphics systems.
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.
GLframe is an OpenGL 3D engine which is used to create game and 3D softwares. It is a fully free and Open Source software under the BSD license.
Ignproj is an open source program developed by four students from EPITA, an engineer school in France. This program is able to transform a 2 dimensional map into an 3 dimensional map.
Meshtab is a 3D library.
A fast and lean render engine with multiple renderbackends
TacitPixel is a scalable C++ framework for building application prototypes for interactive collaborative VR/AR applications. It provides a number of features that make prototyping fast and portable. TacitPixel is the successor of the TAP and Twisted Pair engines.