RenderDoc is a stand-alone graphics debugging tool
Dust3D is a cross-platform open-source 3D modeling software
3D modeler, 3D game maker, 3D demo maker
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Cross Platform GUI Toolkit
Resilient Image Library - successor to DevIL
Tiny OpenGL Wrapper / 3D Engine in C++
Cross Platform Professional Procedural Terrain Generation & Texturing
Vivid is a modern C++ 3D engine using OpenGL4+
Cross-platform 2D and 3D game engine
Character animation system for games and simulations.
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Arkanoid game using SFML library implemented in C++
Realtime 3D engine for game development
Perl bindings to the Modern OpenGL API
A public domain cross platform 3D game