C to Common Lisp compiler
CMUCL is a high-performance, free Common Lisp implementation which runs on most major Unix platforms.
Thinlisp 1.0 with patches to fix build problems, in 2004. Thinlisp has not been updated since. Thinlisp is licensed under an Apache 1.0 style license, which is incompatible with the GPL. For these reasons, you are much better off using ECL instead.
Common Lisp Interface Manager 2.0 based on the open source release by Franz, Inc.
TOS stands for The Original Series as a reference to Star Trek: The Original Series.