Regular awards for best raytraced still images and animations submitted by the public. Site includes most recent winners, voting on the current round, and the topic and rules for submitting to the next round. http://www.irtc.org/
A raytracer trying to aid lighting designers and architects by predicting the light levels and appearance of a space prior to construction. It uses a hybrid approach of Monte Carlo and deterministic ray tracing. Available for Unix. http://radsite.lbl.gov/radiance/HOME.html
An extensible system for creating ray-traced images. It is written in C, yacc, and lex, and runs on Unix, AmigaOS, OS/2, DOS and Older MacOS. http://graphics.stanford.edu/~cek/rayshade/
Plug-in for Rhino, uses both raytracing and radiosity to create single-frame images and animations. Product description, gallery, training, evaluation download, and purchasing. For Windows. http://www.flamingo3d.com/
Advanced raytracing system, supports subsurface scattering, all the standard 3D Studio MAX materials, environments and atmospheres filters. Demo version for download. http://www.vrayrender.com/
Home of the Lparser, the program reads a Lsystem description and processes it into a 3d form which can then be outputted in several formats, including VRML, DXF and POV. http://home.wanadoo.nl/laurens.lapre/
A simple raytracer in development, it supports the basic features of a raytracer along with multi-threading. Many platforms are supported (Win32, Linux, and iPAQ). http://www.yasrt.org/