free software

At work we currently have a discussion: I'd like to develop some components as Free Software. My bosses like the idea, but the client goes nuts only thinking about it.
So as part of the discussion I thought to collect those companies who actively advertise their Free Software. I know about the big ones, but it would be even more interesting to get a list of succesful small companies that share at least part of their inhouse projects. On the other hand it would not be too interesting to list full Free Software companies like Red Hat.
It would also be fine to share this list in some wiki (FSFE?) when it grows larger. For some companies I also list very popular projects from my point of view.

big companies

• Adobe
• Facebook: Cassandra, Thrift, Scribe, HipHop for PHP, ...
• Yahoo: YUI, Design Pattern Library, YSlow, Hadoop, ZooKeeper
• Twitter
• Google: Chromium Browser, Google Summer of Code, Android, Google Web Toolkit (GWT), Protocol Buffers - data interchange format, Java Collections Library, unladen-swallow - faster implementation of Python, ...
• IBM: Developerworks (Tutorials), Eclipse, International Components for Unicode (ICU)

middle sized companies

• Digg

small companies

• 101tec (now Datameer): Katta (distributed lucene on Hadoop), zkClient

As I've already written, I'm working on an alternative to topgit. I made a first attempt in perl some weeks ago, but gave up after some frustrating hours. Yesterday I started again in python and had a very nice time putting together the groundwork and the first two commands.
It may be noted, that I've no previous programming experience in neither perl nor python!
By now, I can create a patchset branch and add a patch branch to it. There's still a lot to do. For my talk at the Debian Mini Conference in Berlin next month I'd like to be able to update patch branches, export patchsets and give a status summary.
Maybe I can already find somebody who's interested in joining me with this project? The code is in my github account, however the name will most probably change.
One reason that I've been much faster in python is the fantastic python-git library. I can only recommend it!
In other news: I'm searching a couch to surf in Berlin from june 7.-12. I prefer couchsurfing over hotels mostly to get to know nice people around the world. Please contact me, if you'd like to host me for a night or two. (thomas at koch punkt ro)