Jet3D

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"Jet3D is a state-of-the-art 3D graphics engine built for high performance real-time rendering. Jet3D offers advanced lighting features, 3D modeling support, seamless soft-skin polyonal characters and many other innovations. "

Jet3D supports everything you need to start a DirectX-based Windows game: 3D rendering, audio, input, physics and networking. It is currently undergoing an update to DirectX 9.0 and a community developed wrapper for Delphi (J4D) is in the works.
UPDATE: A basic implementation of the DirectX 9 driver has been finished and released. Get it here

1 Features
2 Platforms
3 Tutorials and Source
4 Games Using Jet3D
5 Related Weblinks

[edit]

Features

Taken from Jet3D Features page.
'NB: Please note that the engine is currently being updated to DirectX 9.0 and many of these features are likely to change significantly in the near future.

Environment

Exceptionally fast rendering
Radiosity lighting
Integrated rigid body physics simulation support for world objects
Pre-computed lighting for animating light intensities and simulating caustics
Environment uses BSP trees for fast visibility culling
Dynamic RGB lights
Dynamic shadows
Dynamic fog
Dynamic mirrors
Dynamic water effects
Dynamic texturing effects such as procedurals, animations, blending, and morphing
Area portals allow selective rendering of world geometry
Translucent world geometry for windows, or other effects
Spherically mapped sky for seamless sky and horizon
3D sound positioning and attenuation
User extendable special effects and particle systems
Bitmap and Windows font support for labeling the screen, textures, or bitmaps

Editor

CSG editor builds geometry optimized for 3D environments
Built in keyframe system to animate world geometry
Multiple compilation options, including fast recompiles for changes to non-geometrical objects such as lights and entities
Configurable entity definitions for sharing level data with applications
Built in physics entity definitions for specifying interactions between physically controlled objects

Characters

Seamless soft-skin polygonal characters
Automatic visibility culling for optimal performance
Tools to support character and animation authoring for 3D Studio Max
Smoothing group support for high quality shading
No limit to the number of materials used to texture or color characters
Materials can be animated using tinting, procedurals, animations, blending, and morphing

Character Animation

Animation based on either a hierarchical or a non-hierarchical bone system
Arbitrarily spaced keyframes in time
High quality interpolation between keys - second order continuity across orientation keys
Sharing of animations across different characters
Animations can be blended and mixed or partially applied
Animations are optimized to take up minimal space
Interpolation and blending subsystems can be used independently to animate other user objects

Driver Support

D3D (full screen and in a window)
Software driver for support on machines without hardware acceleration (full screen and in a window)
Built in texture and lightmap caching
Takes advantage of 3D hardware that supports multitexturing
2D bitmap overlays

Technical Details

Physics subsystem can be used to control world geometry, or independently to animate other user objects
Virtual file system allows file IO access to collection files, memory files, dos file systems, and user extendable file systems transparently
Math support for vectors, matrices, and quaternions
Comprehensive support for texture and bitmap formats, mipmaps, and conversions
Basic network transport support for multiplayer
Fast collisions against the world geometry
Volumetric queries to determine the type of volume(s) a box lies in
Multiple worlds can be loaded and rapidly switched between
Multiple renders from different cameras can be mixed in a single frame
High level polygon API for adding persistent or temporary user drawn objects