SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Blitz3D - Create 2D and 3D Games for Windows.
raylib - Cross-platform, open-source game development library in C.
BlitzMax - With the developing version BlitzMax NG other 'targets' are available: ARM architecture, Raspberry, Android, HTML (Emscripten). RAPID DEVELOPMENT. Just open the IDE, write your code, hit F5 and see immediately the results!
WebGL - WebGL is a JavaScript API for rendering interactive 3D computer graphics and 2D graphics within any compatible web browser.
Monkey 2 - An easy to use, cross platform, games oriented programming language