This plugin adds a button to the widget's admin page that will delete all inactive widgets.
This plugin checks the health of your WordPress installation.
Automatically logs out inactive users.
This plugin helps to minimize some security concerns. It will automatically sign an inactive user out after a specified time period of inactivity.
Logs out users within defined time when inactive. Modify to show only wake up message and not log out as well. Supported for multisites as well.
Changes visibility of a blog after it has had no activity for a specified amount of time.