SFML - SFML provides a simple interface to the various components of your PC, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.
Pygame - Pygame is a set of Python modules designed for writing games.
raylib - Cross-platform, open-source game development library in C.
Unity - The multiplatform game creation tools for everyone.
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.