First and foremost, SwarmDB is a proof-of-concept key-value RON store. In SwarmDB, every key is a RON UUID and every value is a RON frame. SwarmDB is versioned, replicated, offline-ready and it always synchronizes correctly. SwarmDB provides strong eventual consistency (with causal CRDTs).
SwarmDB = RocksDB + RON + RDTs
The reliance on RocksDB makes SwarmDB embeddable, but still able to bear high server-side loads. Everything that has LevelDB or RocksDB bindings could also have SwarmDB bindings.
Caveat: SwarmDB is not a NoSQL database in the usual meaning. It is more like a versioned documents store. SwarmDB has no query language of the usual kind; it only serves key-value RON queries.
SwarmDB is like
git for your data, but there are certain differences.
SwarmDB stores structured data (arrays, sets, maps, objects), not just binary blobs.
It provides JSON, text, CSV and other interfaces using mappers, but it is not a JSON or a CSV store.
Inside, it is RON RDTs all the way down.
Again, SwarmDB has a very advanced versioning/sync machinery, but the query language is very rudimentary. It is not a MongoDB killer, but more like a syncable storage engine.
SwarmDB can synchronize in arbitrary topologies, work offline or work in real-time, merge concurrent changes, etc. On top of SwarmDB one may build:
SwarmDB itself is a syncable storage engine.