Dust3D is a cross-platform open-source 3D modeling software
A fully-featured OpenGL and GLFW extension for PHP
One Must Fall 2097 Remake
3D modeler, 3D game maker, 3D demo maker
Cross Platform GUI Toolkit
Lightweight, high-performance HTML renderer for game developers
Tiny OpenGL Wrapper / 3D Engine in C++
Cross Platform Professional Procedural Terrain Generation & Texturing
Growth-grammar related Interactive Modelling Platform
Cross-platform 2D and 3D game engine
Character animation system for games and simulations.
Simple, open-source 2D graphics for everyone
A public domain cross platform 3D game
3D .NET engine for Windows, Linux, Mac
Java 2D graphics/utility library
A cross-platform game framework based on OpenGL and GObject.
A cross platform utility for packing images onto a single sprite sheet
Cross-platform reimplementation of AMOS BASIC (runtime)
AMOS BASIC reimplementation in Java
Game engine supporting many 3D/2D formats and graphic effects