There's a few counterexamples, which is a good thing: iXSystems does a lot of cool community work via FreeNAS, PC-BSD and FreeBSD. Github (Ruby), thoughtbot (

There's a few counterexamples, which is a good thing: iXSystems does a lot of cool community work via FreeNAS, PC-BSD and FreeBSD. Github (Ruby), thoughtbot (Ruby), Google (Go, Python), Dropbox (Python), AT&T (C++, Ruby), Zurb (Ruby, Foundation), Twitter (Ruby, Scala), ... missing a bunch and some platforms too.