You can make it - Open Source MMORPG Platform
Open source library for N64 development
Open source library for creative expression on the web, desktop, etc.
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
High-efficiency minimalist C++ wrapper for OpenGL 4.3
SDL based generic 2D game engine
A real-time game development platform
3D .NET engine for Windows, Linux, Mac
C library for manipulating Minecraft world data
A retro style video game engine for RPGs and adventure games.