Free, cross-platform 2D game engine powered by Haxe and OpenFL
A dead simple 2D game engine for Go
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Desktop/Android/HTML5/iOS Java game development framework
Open source library for creative expression on the web, desktop, etc.
Cross-platform game engine in Rust
One framework for creating powerful cross-platform games
Orx: Portable Game Engine
Everything you need to build and deploy scalable realtime 3D apps
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Cross platform SDK
2D Game Engine
ZED OS the clone of Windows XP
Cross-platform 2D and 3D game engine
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Egret is a brand new open mobile game and application engine
Science Fiction, heavy assault, disestablishment of power.
2D physics engine for games
Hungry Hero is an open source Flash game built on Starling Framework.