Thanks, that's a great list! Might be worth mentioning our engine there too, for people who want a graph database atop SQLite and other battle-tested relational databases like MySQL, MariaDB, Postgres.

My team and I built it over the years, and it's open source (AGPL). Here is how it works: https://community.qbix.com/t/qbix-streams-as-a-graph-databas...

Our database abstraction layer (and optional ORM) has been battle tested in production for millions of users, and has 3 adapters: Sqlite, Postgres, MySQL/MariaDB. And recently it even added vector search for ranking results by similarity: https://github.com/Qbix/Platform/tree/main/platform/classes/...

Documentation for the database layer is here: https://qbix.com/platform/guide/database

PS: If you do use a relational database for storing graph data, you're going to have a lot of duplication in some public keys. I highly recommend putting ZFS underneath, to help with deduplication. ZFS uses zstd, developed at facebook, and also can encrypt your data at rest (don't use the relational database to do the encryption, otherwise deduplication doesn't work).

very cool site!