open-source c-plus-plus opengl game-engine cpp sdl2 game-development glsl openal bsp quake-engine pbr 3d-game-engine fps-engine unvanquished idtech3 pbr-shading relief-mapping xreal open-source-game-engine

distributed-systems mesh-networks simulation social-network distributed-computing mmorpg virtual-reality dao rules-engine local-multiplayer community-project nft e-sports reinventing-the-wheel local-first open-source-game-engine argumented-reality persistant-world