A game framework written with osu! in mind.
Powerful, mature open-source cross-platform game engine for Python
A simple and easy-to-use library to enjoy videogames programming
Cross-platform 2D game engine focused on ultimate productivity
A modular Common Lisp game engine
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
PyCAPGE - Python Classic Adventure Point and Click Game Engine
LIKO-12 is an open source fantasy computer made using LÖVE
Modern 3D engine and IDE written using C# and C++.
Multiplayer game server based on Node.JS
C++ Framework for slot machine games
Hungry Hero is an open source Flash game built on Starling Framework.