triplit

A full-stack, syncing database that runs on both server and client. Pluggable storage (indexeddb, sqlite, durable objects), syncs over websockets, and works with your favorite framework (React, Solid, Vue, Svelte). Maintained by aspen-cloud on GitHub, where it has earned 3,099 stars from the community.

It's actively developed around bun, cloudflare-workers, crdt, and is a solid reference for anyone building with these tools.