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

Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

Desktop/Android/HTML5/iOS Java game development framework

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

A dead simple 2D game engine for Go

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