Godot is a powerful cross-platform game engine
Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
Open source library for creative expression on the web, desktop, etc.
A game framework written with osu! in mind.
Gideros Release version
Orx: Portable Game Engine
Examples of procedural geometry for Unity3D C#
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Game engine supporting many 3D/2D formats and graphic effects
INSTEAD - Simple Text Adventure Interpreter.
Cinema Enters Game Console
Cross-platform 2D and 3D game engine
Reactive extensions for Unity
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
Asphyre is a cross-platform framework for Delphi and FreePascal.
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Cross platform Game Creation Software
Hungry Hero is an open source Flash game built on Starling Framework.