Gioxx

The plugin provides the administrator with a convenient maintenance page, called E-mail User Cleaner, which will be navigable through the WordPress administrative interface. 
From the E-mail User Cleaner page you will be able to: 
 – generate and download a CSV file containing a complete list of registered users on the WordPress instance. 
 – Specify one or more e-mail addresses (one address per line), corresponding to registered users on the WordPress instance, to be deleted from the system. 
 – Identify duplicated users (based on criteria that checks first name, last name and e-mail address) and decide to select and delete them, also referring to the last login date to the WordPress installation.

E-mail User Cleaner

Delete users corresponding to the specified email addresses.

Antonio D.

Daniil Zhitnitskii

With use of this plugin you will not longer need to care about clean state of your database because of plenty of revisions. Once the plugin is activated, every time you visit admin dashboard of a site it will automatically detect revisions, which are older then you need, and flush them from database.
Only works with multisite installation!
<h3>Disclaimers</h3>
The Simple Revision Cleaner plugin is supplied “as is” and all use is at your own risk.

Simple Revision Cleaner

This plugin provides simple handy tool for automatic cleaning database from old, non-relevant revisions on your web-site.

E-mail User Cleaner vs Simple Revision Cleaner