Castle Game Engine is a free and open source application designed for developers who want to build 3D games. It is a cross-platform 3D game engine written in Object Pascal.
Castle Game Engine supports many 3D formats, including X3D, Collada, VRML, MD3, 3DS, reading and writing of X3D, converting 3D models to X3D. It includes a modern OpenGL renderer using VBOs and shaders, shadows using shadow volumes and maps, mirrors using cube environment mapping and other methods.
Scene manager, custom viewports, creatures (with AI), player, inventory working out of the box, items, bump mapping, screen-space effects in GLSL, as well as 3D sound using OpenAL, are also part of the Castle Game Engine application.
Being written in Object Pascal, the application is supported on the Linux, FreeBSD, Windows, and Mac OS X operating systems. Lazarus components for RAD development are also included.