Powerful, mature open-source cross-platform game engine for Python
The Ren'Py Visual Novel Engine
A game engine powered by python and panda3d
A retro game engine for Python
Open source clone of the Age of Empires II engine
A refreshingly simple data-driven game engine built in Rust
3D game engine/framework in C, with Luajit and Python bindings now
A pure Go game engine
An OpenGL RTS game engine written in C
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Pycraft is an open-source, OpenGL based game made in Python
GemRB is a portable open-source implementation of the Infinity Engine
Tools and Z80 engine for creating adventure games. (RUST)
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Free, open source game engine online
A cell-based puzzle game featuring classic and completely new puzzles
A game engine for console based text games
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Go 3D Game Engine
Python ctypes module for the Irrlicht Engine SDK
DOOM / Heretic / Hexen source port with enhanced graphics and UI
KlayGE is a cross-platform open source game engine