WP Privacy

This plugin allows a second password option and thus making your website doubly protected.

AdminPass allows administrators to bypass password protection and admins/editors to view passwords for protected pages, posts, and custom post types.

Password protect individual posts, pages, and public custom post types with a simple per-content password field.

A simple and lightweight password protection for Wordpress.

Password Protect Pages, Posts & Content in WordPress

Password protect WordPress pages and posts by user roles or with multiple passwords; protect your entire website with a single password.