A development environment focused on modding
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-Platform C++ 2D/3D game engine
Flax Engine, multi-platform 3D game engine
Simple and light-weight 3D game engine
Dust3D is a cross-platform open-source 3D modeling software
An iOS & tvOS Frontend for Multiple Emulators
3D and 2D game engine written in Rust
Java/JavaFX/Kotlin Game Library (Engine)
Open game and rendering engine packed into a JavaScript framework
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
3D Procedural Game Engine Using OpenGL
LayaAir is an open-source 2D/3D engine
Powerful, mature open-source cross-platform game engine for Python
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Everything you need to build and deploy scalable realtime 3D apps
Embeddable unity game engine view for Flutter
Doom-based AI research platform for reinforcement learning
GemRB is a portable open-source implementation of the Infinity Engine
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Go 3D Game Engine