As of right now (beginning of June 2010) there is only one implementation. It is written in Java and is called enigma (with a lowercase e). The code is bulky and was not written by an experienced Java hacker. For v0.2 it may be a good idea to write the interpreter in C instead. Implementing a foreign function interface should be easier that way.
The current implementation can be downloaded at http://metanohi.org/projects/enigma.