Yes! You can use any Identity Provider (IdP) that supports OpenID Connect (OIDC).

I've documented this in https://yolinks.app/docs/getting-started/configuring-an-orga... (scroll down to "Single Sign-On (SSO)"; I'm still trying to figure out a good way for React + React Router and header anchors to play nice together, so apologies for making you scroll). I haven't documented the set up within IdPs like Okta. I've noticed many software vendors have IdP-specific instructions as well, so I may follow suit eventually.

I don't support SAML, but it should be relatively straightforward given that I use Google Identity Provider. I'd be very curious to know if SAML is important to folks.