Open source cross-platform multi-purpose game toolkit
Stride (formerly Xenko), a free and open-source cross-platform C# game
Cross-platform 2D game engine focused on ultimate productivity
An open source implementation of the Ultima Online Classic Client
One framework for creating powerful cross-platform games
Lightweight console for Minecraft chat and automated scripts
A game framework written with osu! in mind.
3D Engine c++
2D Game Engine
Repository of desktops and programs for the Cygwin platform
3D .NET engine for Windows, Linux, Mac
A Simple Yahtzee like game.
Experiments in turn based strategy gaming.
A cross-platform game framework based on OpenGL and GObject.
4x Strategy. Star Control Universe.