The best solution to show a different theme to logged in users.

The simplest way of controlling who sees what in your posts/pages. Restrict content to logged in users only (or guests, or by roles) with simple shortcodes.

Requires at least 3.9

Add bbPress only sidebar, Add bbpress login link, bbpress register link, forget password link, log out link in bbpress forum index pages or bbpress single forum pages or bbpress forum pages or bbpress topic pages.

Requires at least 3.6

Create great looking documentation for anything with this plugin. Great for FAQS and more!

Enable specific post/page content to be displayed by "logged in members only" using shortcodes. NEW- shortcode for displaying content to guests.

This plugin lets you simply add a visiblity option for logged in and logged out users

Enforce strong passwords during user registration for Restrict Content Pro

Requires at least 3.3

Limit job submissions and resume access through WP Job Manager to paid subscribers in Restrict Content Pro

Requires at least 3.2

This plugin adds all WordPress pages from the admin sidebar under the "site-name" menu on the front-end.