This File Management & Digital Store plugin which will help you to control file downloads & sell digital products from your WP site.
WP Content Protection plugin is used to protect the content.No membership required for this protection.
This plugin allows a second password option and thus making your website doubly protected.
WP Curtain is a simple plugin that allows you to hide your website from the general public and display an elegant countdown timer.
HTTP Basic Authentication as secondary defense for wp-admin - blocks brute force attacks. Also blocks users (bots) with No-Referrer Headers.
This plugin puts a global password selected by you on all posts. Based on Matt Mullenwegs plugin "Protect old posts"