Couchbase Lite is an Apache-licensed native JSON database for iOS and Android with offline synchronization support.
At a hackathon last year it took a couple of hours to add GeoCouch-style bbox queries to Couchbase Lite. I’ll walk through the implementation of the geo indexer and how it fits into the Couchbase Lite codebase.
Also expect to be wowed by examples of the power of sync + geo.