Free, cross-platform 2D game engine powered by Haxe and OpenFL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A retro game engine for Python
RPG Maker 2000/2003 and EasyRPG games interpreter
API (C#) for simulating certain aspects of a ZX spectrum for porting.
Free, open source game engine online
Murder is a pixel art ECS game engine
A hand-crafted 2D game library in Go
Vivid is a modern C++ 3D engine using OpenGL4+
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
A free ActionScript 3 library designed for developing 2D Flash games
A retro style video game engine for RPGs and adventure games.