Open source
Apache CouchDB
Document database with multi-primary sync over HTTP and JSON
NoSQL DatabasesSync friendly documents
3 tools in our directory are marked as best for Offline-first app teams, from 2 sections: Databases (2) and Mobile Development (1).

Document database with multi-primary sync over HTTP and JSON

Sync engine that keeps a local SQLite database in step

Local-first NoSQL database for JavaScript apps with sync
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