The Penguin Liberation Front is a team that builds packages that are patent encumbered or proprietary. The PLF has been providing litigious packages for Mandriva for many years. Currently the team is doing the same thing for Ubuntu.
Soundflower is a MacOS X (10.2 and later) system extension that allows applications to pass audio to other applications.
AtomicParsley is a command line program for reading, parsing and setting iTunes-style metadata in m4a files (really any mpeg4 file container: m4b, m4p, m4v, mp4).
Cygwin is a Linux-like environment for Windows - for sel ;-)
desktop blogging client for MacOSX and Windows