Creates a 'Coming Soon' page that will show for all users who are not logged in
Plugin directory
private plugins
WordPress plugins for private. Launch any one in a live sandbox in seconds.
Force Login is a simple lightweight plugin that requires visitors to log in to interact with the website.
Create a Private Site visible only to your registered users.
Instantly turn your WordPress installation into a private corporate intranet
BuddyPress Members Only restricts Your Buddypress and Wordpress to logged in/registered members.