A development environment focused on modding
An easy to use tool to change the behaviour of your input devices
A retro game engine for Python
Lutris desktop client in Python
Create Minecraft bots with a powerful and high level JavaScript API
Free, open source game engine online
Open source clone of the Age of Empires II engine
RPG Maker 2000/2003 and EasyRPG games interpreter
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Powerful, mature open-source cross-platform game engine for Python
CTFs as you need them
Doom-based AI research platform for reinforcement learning
The Pokémon API
3D game engine/framework in C, with Luajit and Python bindings now
The AWS GameKit Plugin for Unreal
A terminal based Pokemon like game
StarCraft II learning environment
Pycraft is an open-source, OpenGL based game made in Python
A simple and fast game launcher for Windows 7,8,10,11 made in Godot.
Free Karaoke File Maker
GemRB is a portable open-source implementation of the Infinity Engine
Cooperative multiplayer graphical RPG and adventure game
MedGui Reborn is a frontend (GUI) for Mednafen multi emulator.
For exploring cellular automata like Conway's Game of Life.