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!
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
BlitzPlus - Create 2D Games for Windows.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Monkey 2 - An easy to use, cross platform, games oriented programming language
WaveEngine - The definitive free cross-platform mobile engine to unleash your games using C#.