Darn, I actually went to the site looking for a 'donate' button, but it looks like it's commercially backed. I definitely want something like this to exist.
The project can take donations and we did work supported by grants from the NLNet Foundation (http://nlnet.nl/) for a while. It is commercially controlled in the sense that KO GmbH has a CLA that contributors sign. But the project itself is AGPL (with pretty standard dual-licensing).