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.
Unity - The multiplatform game creation tools for everyone.
raylib - Cross-platform, open-source game development library in C.
Struckd - 3D Game Creator - Struckd is the next-generation gaming platform for user created content where people of all ages...
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.