CLPython (http://common-lisp.net/project/clpython/) is 
  an open-source implementation of Python written in 
  Common Lisp. 
  It bridges the Python and Lisp worlds, so you can:
   * access Python libraries from Lisp;
   * access Lisp libraries from Python.

Runs on 6 different CL implementations. Like Berp it can interpret and compile if the underlying CL implementation supports compilation.