I’ve been using Outline for a while now. It has access control, external login (oidc, LDAP, GitHub, etc), a markdown compatible editor, plenty of integrations and is open source.

It’s fairly new and has some annoying bugs like not being able to resize mermaid diagrams, but for basic text articles it’s perfect.

Why would you need this for your scenario? If you’re not downloading you can simply check the listenbrainz recommendations in the playlists that it creates for you