RetroArch is a frontend for emulators, game engines and media players.
The game engine for everyone
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
New Godot bindings for Swift
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source library for creative expression on the web, desktop, etc.
A MUD client for Android, iOS, Linux, Mac OS X and Windows
3D Engine c++
GemRB is a portable open-source implementation of the Infinity Engine
Platform independent browser based Str8ts solver
Platform independent browser based Sudoku solver
Urho3D Game engine
Play Sudoku on your Mobile and Windows
ZED OS the clone of Windows XP
2D Game Engine
Character animation system for games and simulations.
A cross-platform interpreter for many point-and-click adventure games
Modern AS3 Game Engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Science Fiction, heavy assault, disestablishment of power.
Hungry Hero is an open source Flash game built on Starling Framework.
Modified Pokemon games for emulators or devices.