I have a lot of different services which I self host for me and my family like:
PeerTube
Lemmy
Mastodon
Synology NAS
TTRSS
NextCloud
Matrix
HomeAssistant
etc.
Right now every family member needs to create a user on each of those services and have a different password on them, which is OK when you use a Password Manager, but most of my extended family members don't. And they often forget their password and stop using the service because they can't figure out how to reset the password with each and every service.
I would like to try to consolidate all of it with a Single Sign-On (SSO) solution but It's not obvious to me if there is one which is not overly over engineered for hundreds of thousands of users but small and lightweight, perhaps even easy to set up.
I tried OpenLDAP but Jesus that was very involved.
I've found Zitadel to be the best open source Oauth2 provider. It also supports terraform for a fully IaC approach to declaring your users and their permissions.
I can only support that. This is what I am running for my small business as well and it's been super smooth for roughly a year now!
Especially self service and auto-registering based on domain names turned out to be really nice features (for a business).
In my homelab I just enjoy having a nice ui.