A game framework written with osu! in mind.
Game engine supporting many 3D/2D formats and graphic effects
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Cinema Enters Game Console
Modern 3D engine and IDE written using C# and C++.
Build Cross-platform Applications
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Asphyre is a cross-platform framework for Delphi and FreePascal.
Perl bindings to the Modern OpenGL API
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Multimedia asset management and manipulator for Étoilé
Cross-platform C framework very compact libraries and tools.
Educational framework for OpenGLES, OpenCL and OpenAL
A cross-platform game framework based on OpenGL and GObject.
2D Game Engine, based on OpenGL and focused on Isometric Games
A graphics engine + toolkit.
3D game engine for C and C++
Extremely simple joystick rumble / vibration library