I just took a look in the Genossenschaftsregister (GnR) for Munich and came across a few coops in the IT sector (e.g., http://www.7-it.de/genossenschaft/mitglied-werden.html).

Not sure if they fit your profile, but it might be worth taking a look: https://www.handelsregister.de/rp_web/mask.do

Thanks, didn't know there was such a public database. Seems hard to search though, there are no tags or categories or something.

Searching for "IT" turned up some results.