Scalix the Chameleon
Scalix has always been something of a showcase for how GNU/Linux can be used to run enterprise-level software. And yet, ironically, Scalix itself has been proprietary.
Until now.
Given that the company was successful with its earlier strategy, this move to a dual-licensing approach is an interesting comment on the even greater advantages of being open source, and not just running on it. (Via Linux-Watch.)