The ioquake3 community effort to continue supporting/developing id's
A game engine with an emphasis on real-time cutting-edge solutions
RPG Maker 2000/2003 and EasyRPG games interpreter
All-in-one game engine built on Godot. Roblox & UEFN alternative
The multiplayer game engine
A hand-crafted 2D game library in Go
Amazon Lumberyard is a free AAA game engine
A cross platform Lua based game engine
A project to create a blazingly fast Swift game engine
Free Android 2D OpenGL Game Engine