Jon Christopher

It’s insecure to send user account passwords via email, so use this plugin to issue a password reset instead.

New User Password Reset

Automatically issue a password reset when creating new Users

shazdeh

The WordPress Database Reset plugin allows you to reset the database back to its default settings without having to delete the site and recreate it.
Useful tool for theme and plugin developers who often have to clean up the mess and start over.

WPMU Database Reset

Clean up a single site in a WP network, by removing all posts, comments, terms and media files. A clean slate for the site.

New User Password Reset vs WPMU Database Reset