Baasbox DB is orientdb, which is open source: https://github.com/orientechnologies/orientdb
Sorry to the baasbox db team for the incorrect assumption. But it might be a good idea to make the underlying db a bit clearer, assuming I didn't miss any obvious mention of it (which is quite possible).
orientdb is a fine db, indeed it's one I was thinking of when I was wondering (incorrectly) why they wrote their own.
Thanks for your correction.
What is the benefit of using proprietary platforms like Parse and Stackmob?