A looong time ago, when OpenID was sort-of new, I implemented my own OpenID provider, because I wanted to log into StackOverflow and other places, but I didn't want to use a third party service.<p>That worked swimmingly in the few places that supported OpenID, but eventually even StackOverflow dropped support.<p>I must admit I haven't kept up with what has happened since in this area, so stupid question:<p>Could I install this server and have my own OAuth2/OIDC provider that would allow me to login to websites using my own provider (instead of "Login with Microsoft Github", "Login with Facebook", "Login with Google", "Login with Twitter"), or is this something else/the reverse?