Looks real slick! I started playing around with Base (no affiliation, found it via HN a couple of weeks ago) and it's nice to have something easy to integrate with for common stuff like user management etc., but the offline dev story there is lacking. Nice to see Appwrite provides a containerized solution for that, should make distributed dev (and testing!) a lot easier. I'm gonna set aside some time today to play with this, thanks for sharing!

License looks good too: https://github.com/appwrite/appwrite/blob/master/LICENSE