We actually tested Axelor as well! At the time, their documentation was quite lacking (in English at least) to the point that their installation instructions didn't result in a working system. (We got it working using a windows system and an older version, but weren't able to do so on a Debian?? system with the latest version at the time) I would be very happy to hear that things have improved because Axelor is probably the most 'user-friendly' and 'pretty' system we tested - assuming it's functioning.