SDL 2

DeepMind Labdeepmind/lab

A customizable 3D platform based on Quake III for agent-based AI and deep reinforcement learning research.

nCinenCine/nCine

A cross-platform 2D game engine written in C++11 with optional Lua scripting, emphasizing performance.

Doomsday Engineskyjake/Doomsday-Engine

A portable, enhanced source port for Doom, Heretic, and Hexen with modern graphics and cross-platform support.

The Eternity Engineteam-eternity/eternity

An advanced DOOM source port with enhanced scripting, high-resolution support, and cross-platform compatibility.

is::EngineIs-Daouda/is-Engine

An open-source C++ game engine using SFML and SDL 2 to build and export games for Nintendo Switch, Web, Mobile, and PC.