rt
Short for "regression testing", an older (last update 1995) Test Framework from the CMU AI Repository.

Paul Dietz has added some features to rt for his GCL ANSI Test Suite. These extensions have been incorporated into sbcl's sb-rt package and Kevin Rosenberg's cl-rt Debian package. Kevin Rosenberg maintains a asdf-installable download below:

ASDF-install package (obsolete) http://files.b9.com/rt/rt.tar.gz

Also available through GIT:

git clone http://git.b9.com/rt.git

There is a CLIM (McCLIM) GUI for RT:

http://boinkor.net/lisp/rt-clim.lisp