Java Ray Tracer
- Java ray tracing engine distributed under the GNU General Public License. Images, screenshots, download, and feature list.
- http://j3d.sourceforge.net/

Realtime Raytracing Maillist
- Discuss programming techniques, algorithms and productions related to realtime raytracing, both software or hardware based.
- http://groups.yahoo.com/group/realtime_raytracing/

Ray tracing in Wikipedia
- A overview non technical article on ray tracing also covering some history of the subject.
- http://en.wikipedia.org/wiki/Ray_tracing

FAQ for realtime raytracing
- The FAQ about speed optimization for raytracing for use in realtime raytracing.
- http://www.acm.org/tog/resources/RTNews/demos/rtrt_faq.txt

Tachyon Parallel / Multiprocessor Ray Tracing System
- A ray tracer distributed as C source, supporting almost every Unix version, Windows NT and Mac OSX.
- http://jedi.ks.uiuc.edu/~johns/raytracer/

GRT Raytracer
- Raytracing system written in Common Lisp. It trys to become good classical raytracer: reasonably efficient, with a good selection of primitives, advanced texturing capabilities, animation support, and probably integration of the scripting environment with
- http://www.nongnu.org/grt/

Chuck's Ray Tracing Software
- Personal page with links to programs for modeling, Ray tracing, converting, and animating. Plus models for various ray tracers. Windows, MacOS and Unix.
- http://chuckr.bravepages.com/raytrac3.htm

The Rearview Rendering Engine
- A game engine aiming towards three dimensional computer graphics which fits both human perception and the shape of the real world better than common polygon engines do. Linux.
- http://rearview.sourceforge.net/

Raytracing-FAQ
- Home of the comp.graphics.rendering.raytracing-faq with a online version.
- http://www.cg.tuwien.ac.at/rayfaq/

Ray Tracing Introduction from SIGGRAPH
- A basic introduction to building a ray tracer, with some pointers to more advanced subjects at the end.
- http://www.siggraph.org/education/materials/HyperGraph/raytrace/rtrace0.htm

Bagisas
- A GUI the YAFRAY raytracer written in Python. Downloads, screenshots, and FAQ. Available for Linux and Windows.
- http://www.fen-net.de/wolfram.kraus/Bagisas.html

Flamingo
- 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/

Realistic Image Synthesis Engine
- R.I.S.E. is an open source global illumination renderer for producing physically and biologically based photo realistic images. Product specifications, gallery, documentation, and downloads. [Windows, Linux, SunOS, Irix 6.5, Sun Solaris]
- http://rise.sourceforge.net/

Rayshade
- 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/

vlib
- An open source volume modeling and rendering library for unix. The interface facilitates the majority of significant developments in the field to date.
- http://vg.swan.ac.uk/vlib/

Realstorm
- A realtime raytracing engine with downloadable benchmark, screenshots and information. Windows 95/98/me/2000.
- http://www.realstorm.com/

Ray Tracing News Guide
- Lots of information on ray tracing. Updated once or twice a year.
- http://www.acm.org/tog/resources/RTNews/html/

CoolRay
- Open Source Raytracer with a scene description language that provides constructs for programming like loops and functions. Its written in C++ and runs on Windows and Linux/Unix.
- http://www.coolray.org/

RayTraccio
- A Java ray-tracer running as a applet that wants to be simple and clean but nonetheless has some advanced features.
- http://www.lapo.it/RayTraccio.html

Brassman's Modeller And Animation Links
- Links to modelling and animation utilities, many for POV-ray on Windows and Unix.
- http://www-personal.umich.edu/~jeffab/links/modellinks.html

Light in C++
- A C++ class library available as source code implementing a physically correct renderer. Working on Unix and Windows.
- http://www.photon.at/~werner/light/

Introduction to Ray Tracing
- The introduce of ray tracing. Also known as ray casting, determines the visibility of surfaces by tracing imaginary rays of light from the viewer's eye to the objects in the scene.
- http://www.cc.gatech.edu/gvu/multimedia/nsfmmedia/cware/graphics/notes/vsdet/vsray/vsray00.html

Radiance
- 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

Lightflow Rendering Interface
- An object oriented library with API in C++ and Python for synthetic rendering, which provides a common environment and description language to treat light distribution in three dimensional spaces. Available for Linux and Windows.
- http://www.lightflowtech.com/

Renderpark
- Test bed system for physically based photo-realistic image synthesis, mostly radiosity based. Unix based.
- http://www.cs.kuleuven.ac.be/cwis/research/graphics/RENDERPARK/

YASRT Raytracer
- 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/

Internet Raytracing Competition
- 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/

ACM Crossroads: Ray Tracing
- Article on Ray Tracing in the student magazine of the ACM.
- http://www.acm.org/crossroads/xrds3-4/raytracing.html