The flexible game engine
Advanced translator plugin that can be used to translate Unity games
Enables Roblox developers to use professional software tools
Lightweight console for Minecraft chat and automated scripts
A community sourced database of game controller mappings
Automated translation solution for visual novels
Cross-platform, open source, and super fast MUD client with scripting
RPG Maker 2000/2003 and EasyRPG games interpreter
3D space trading and combat game
The HTML5 Creation Engine
Programming eXperience Toolkit
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
An elegant Go board and SGF editor for a more civilized age
The Ren'Py Visual Novel Engine
A game framework written with osu! in mind.
TextWorld is a sandbox learning environment for the training
Just another ComputerCraft fork
A dead simple 2D game engine for Go
Open-source Android/Desktop remake of Civ V
Ark pixel font - Open source Pan-CJK pixel font
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Gradient Bang is an online multiplayer universe
Easy to use Python library for creating 2D arcade games
The source code to VVVVVV
Action RPG that's easy to mod