Arch

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL.

Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.

The ultimate community-driven, and open-source competitive rhythm game available on Steam.

Highly Performant & Scalable Ultima Online Server Emulator

Asheron's Call server emulator.

Clone of the Age of Empires II engine