I’ve been trying out Kavita as an ebook software, and I really like it so far, with one exception. Accounts are all local to the app, and there is no ability handle user accounts through their site, similar to how Plex does it. This means that every time I screw up and have to set up again over the years, my users will have to get new invites and make new accounts. When I mess up Plex and have to reinstall, I can just add new permissions for the users already linked to my account, which makes it easy to transition everyone to a new server with minimal impact to my viewers.
Before I fully commit to Kavita, is there any program out there for ebooks that has accounts managed through a central server rather than my local one?
Jellyfin has a (plugin) opds server for ebooks that use the same accounts as the rest of jellyfin. I use calibre to deal with organization/metadata.
If you have a bunch of plex users, switching to jellyfin might be a bridge too far.
Are jellyfin accounts handled through their own account system like Plex?
No. Jellyfin accounts are local. So you need to set them up on the server. No external auth system