suifengtec

This plugin allows you to add/delete password for all your posts or some sepcial posts.

WP Posts Password Batch Manager

Batch managing your posts password with me.

Sebastian Pisula

wp360

Plugin can be used to automaticlly reset password of password protected pages, posts or custom post types. After activating plugin you will see new option in publish section of posts. Set post visibility to password protected. Next you can choose how often password will be reset. Interval is expressed in days (minimum 1).
New password is sent to website administrator (Settings -> General -> Email Address).

Reset Post Password

Reset post or page password automatically after X days.

WP Posts Password Batch Manager vs Reset Post Password