Open source library for creative expression on the web, desktop, etc.
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
JavaScript framework to build game engines, games, emulators and apps
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
Egret is a brand new open mobile game and application engine
Cross-platform 2D game engine