A development environment focused on modding
Desktop/Android/HTML5/iOS Java game development framework
One framework for creating powerful cross-platform games
An iOS & tvOS Frontend for Multiple Emulators
Fast and lightweight JavaScript game engine built on WebGL and glTF
DeSmuME is a Nintendo DS emulator
Cross-Platform C++ 2D/3D game engine
A charting and data visualization library for Unity
3D Procedural Game Engine Using OpenGL
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Doom-based AI research platform for reinforcement learning
Gideros Release version
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Embeddable unity game engine view for Flutter
Powerful, mature open-source cross-platform game engine for Python
LayaAir is an open-source 2D/3D engine
Free and open source real-time strategy game
3D game engine/framework in C, with Luajit and Python bindings now
Java/JavaFX/Kotlin Game Library (Engine)
Toolkit for developing and comparing reinforcement learning algorithms
A work-in-progress PlayStation 4 emulator
FlightGear Flight Simulator: free open-source multiplatform flight sim