WordPress Front End User ONLY

Hi All

I’m searching for a plugin that will allow for front end users to be allowed on the website. What I do not want is to surface the main wordpress login onto the front end (there seem to be plenty of logins wanting to do this). What I do want is to have a completely separate list of users with zero wordpress permissions to be able to view protected content. I do not want admin users to be able to login via that same form and get to the admin system (i.e. the login must be a separate one).

All ideas welcome here.

Matt