This kit contains a framework for experimenting with Genetic Programing. It contains three different evolvable languages: Genetic2005, Lithium4, and Evoperl.
C++ and Tcl are required to build it (try "yum install tcl-devel"). It works on x86 architecture under Fedora Core 4 or 5 or Centos4.3, but should work on any modern Linux, and shouldn't be hard to port. (The worst part is making a .so file to load into the Tcl interpreter.)