For players:

"The Castle"

First-person perspective game, in a dark fantasy setting.

For 3D modelers:

view3dscene

VRML / X3D browser, and a viewer for other 3D model formats (Collada, 3DS, MD3, Wavefront OBJ, others). Explore the virtual world, with collision-checking, gravity, interactive animations, shadows, mirrors, shaders and more. Convert various models to VRML/X3D.

Don't forget to also download our collection of demo models.

For developers:

Castle Game Engine

Open-source (LGPL) 3D game engine for FreePascal / Lazarus. Excellent support for the VRML / X3D 3D data format, other 3D formats also supported. Many advanced graphic effects.