RSDatabase
This is utility code for using SQLite via FMDB. It’s not a persistence framework — it’s lower-level.
It builds as a couple frameworks — one for Mac, one for iOS.
It has no additional dependencies, but that’s because FMDB is actually included — you might want to instead make sure you have the latest FMDB, which isn’t necessarily included here.
What to look at
The main thing is RSDatabaseQueue, which allows you to talk to SQLite-via-FMDB using a serial queue.
The second thing is FMDatabase+RSExtras, which provides methods for a bunch of common queries and updates, so you don’t have to write as much SQL.