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If you want data sync capability and you prefer to run your own databases, Couchbase Lite is an open-source iOS and Android JSON database that syncs with Couchbase running on your servers.

http://mobile.couchbase.com

It's not a full app platform like Parse and StackMob, we are focussed on the data layer challenge.

I'm all about the Couch/Pouch ecosystem. :)

But you don't have to maintain it! Think of the time savings! /s

There's Apache UserGrid, too: http://usergrid.incubator.apache.org/

This, many times over.