IBM and the REXX Language Association have announced that the IBM version of Object REXX is going to be opensourced, with responsibilities for maintaining the project lying with the REXXLA.
There are a couple of bugs in the OS/2 version of the IBM interpreter; I'm looking forward to getting my hands on the code! I think it might make a good fourth year project for myself....
Preliminary announcement at the [link|http://www.rexxla.org|REXX Language Association] page.