The TRAC Foundation http://web.archive.org/web/20040925234913/http://www.tracfoundation.org/
escargo 2011-08-28 - The http://www.tracfoundation.org/ domain is still there, but the contents are long gone. (Note that links using the http://web.archive.com URLs get displayed wrong by this wiki if surrounded by square brackets.)
RLH 2011-08-28 - What was it? The only Trac I know is a ticketing system for software bugs.
Playing TRAC has a good introduction.
The last useful TRAC Foundation pages I found through the web archive were set in March 24, 2005: http://web.archive.org/web/20050324000031/http://tracfoundation.org/
That page says in part, "TRAC® is an interpreted, interactive, ultra-light-weight programming language which has been in use since 1964."
In the history of programming languages, one aspect that stands out is that they registered the name of the programming language as a trademark, which gave them some control over implementations.
There is still an accessible page on Sourceforge: [L1 ]
Unfortunately, no files were released.
I have not attempted to check the files out of Sourceforge, but info on how to do so is there: [L2 ]