decaf
Decaf is an Java debugger GUI written in Lisp using CLIM. The GUI itself is still rather prototypish, but the debugging library it is based on (CL-JDI) is mostly complete.

Decaf was written for SBCL. It should also work with ACL.

License: GPL

Download: http://www.lichteblau.com/old-src.html#cloak

Readme: http://www.lichteblau.com/cloak/decaf/README.html