Comment by grounder

Hopefully a new company will form to pick up the open source pieces and go from there. I wonder if Fauna tried to find a buyer - it seems like they have some valuable software but weren't able to make it work. Shutting down in 2.5 months is pretty aggressive. Good luck to the former customers.

I was expecting the migration guide to recommend some other options. I don't know of other BaaS document databases like Fauna. I guess Mongo, CouchDB, Couchbase, and traditional Postgres would be the first open source options to look for. DocumentDB for closed source but offered by a big cloud vendor (AWS). If you want to roll the dice again, then maybe SurrealDB or RavenDB.