title: What 'Login as a service' services are there?
body: <p>I'm looking for a cloud solution to login management.  Basically, I want it to be just a login system.  No concept of levels or permissions or anything.</p>
  
  <p>I imagine it being an API that I can sign up for and from my user's perspective, they are logging in to my site, but what it's doing is authenticating and storing the user up in this cloud service.</p>
  
  <p>It could have basic user management, or I as admin could change the levels of authentication.
  Also, this API would handle 'forgot password' and things like that as well.</p>
  
  <p>So basically, it's an API.  I would still be responsible for the UI.</p>
  
  <p>Does this exist?  I could really use it.  Writing login systems for each site/app idea is a lot of work, and I'd rather focus on my app.</p>