This plugin password protects your wordpress blog with a single password.
Put a sitewide password on your site. Users must enter password before viewing content.
A very simple way to quickly password protect your WordPress site with a single password.
Allows site administrators to specifically designate arbitrary posts with any public post type as viewable only after user login.
WP Curtain is a simple plugin that allows you to hide your website from the general public and display an elegant countdown timer.