The A32NX & A380X Project are community driven open source projects
A modular Common Lisp game engine
A high-performance, industry-standard 2D physics engine built on Box2D
2D JavaScript Physics Engine
A 2D rigid body physics engine for the web
Path creation asset for Unity game development
Molecular viewer and prototyping framework
A simulator for drones, cars and more, built on Unreal Engine
Amazon Lumberyard is a free AAA game engine
3D C++ Game Engine - yet another open source game engine
A real-time game development platform
Character animation system for games and simulations.
Open-DIS implements the IEEE DIS protocol in multiple languages.
Simulate high power rocket flights with splash down plots
3D .NET engine for Windows, Linux, Mac
Articulated-body simulation engine written in C
A railway signalling simulation game
Physics Game like "The Incredible Machine"
Open Source 3D Game Engine
A microscopic pedestrian crowd simulation system and library