GNU radio svn repository and bug tracking system. It has a wiki, but that looks rather sparse compared to the one on http://comsec.com/wiki?GnuRadioWiki
There are even more Matlab like programs than I knew. Ironically, a discussion on comp.lang.lisp cited RMS as (I paraphrase) "one advantage of free software is less re-invention of the wheel". Sadly, this does not appear to have happened.