I'm looking for a good plugin (does not have to be free) that would give a site a members only area, much like what's on this site: PPIAC.org. There are pages only viewable to members, and once logged in, if you're given certain admin rights, you can make changes to membership in the organization.
I'd need to have functionality where people can have access to this section of the site separate/different from access to WordPress - when you login on this site, it's a nice user interface that is not the WordPress Admin panel.
Also, does anyone know how to tell what plugin this site is using? If I can find this plugin, that would be awesome.
Thanks so much!