RenderDoc is a stand-alone graphics debugging tool
Dust3D is a cross-platform open-source 3D modeling software
Universal Scene Description
Samples that demonstrate how to build graphics intensive applications
The open-asset-importer-library repository
Powerful desktop publishing software
Vivid3D is a C++ IDE/3D engine, with python scripting.
Cross Platform GUI Toolkit
Qt Visual Graph Editor
Support for legacy OpenGL in core profiles
Resilient Image Library - successor to DevIL
Cross Platform Professional Procedural Terrain Generation & Texturing
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Free yourself
Arkanoid game using SFML library implemented in C++
Realtime 3D engine for game development
Perl bindings to the Modern OpenGL API
A C++ 3D game engine.
A graphical Finite State Machine (FSM) designer.
TurboSphere is an easy to learn and powerful JS based game engine.
A Library for Interactive Modelling and Visualisation