Ryan Willis

This is a plugin for WordPress Multisite 3.0+ that restricts password changes or resets to super admins only. This is handy when user creation and authentication are handled from an external application and passwords should only be changed on one system.

Restrict Password Changes – MultiSite

Restricts multisite password changes to super admins only.

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.

Restrict Password Changes – MultiSite vs Reset Post Password