You can get an OpenID from several popular and well-known providers or host your own. We’ll help you make a smart decision.
Chances are you already have an OpenID but don’t even know it! No problem — we’ll walk you through using your OpenID for the first time.
Run a web site and want to make it easier to sign up or sign in? Find out how to add OpenID to your site in a few steps by using a free, open source library.
Source: OpenID Foundation website