David Sader

A <a href="https://codex.wordpress.org/Create_A_Network" rel="nofollow ugc">Multisite</a> Network plugin to add Network->Settings to limit, or disable, the number of post revisions and set the post autosave interval.
<h3>Notes</h3>
I based the default plugin values for the constants AUTOSAVE_INTERVAL and WP_POST_REVISIONS on the discussion here: http://wpmututorials.com/how-to/managing-autosavepost-revisions/

Limit Post Revisions Network Option

A Multisite Network plugin to add Network Admin->Settings to limit, or disable, the number of post revisions and set the post autosave interval.

JortK

This WordPress plugin will cleanup your WordPress database, which means that it will perform the following actions:
*Remove all post revisions
*Remove all spam comments
*Remove all unapproved comments
*Remove all unused tags
*Remove all unused post meta
*Optimize MySQL tables by removing all unused table space

WP-Cleanup

This Wordpress plugin will cleanup your Wordpress database by remove all unused data from your database.

Limit Post Revisions Network Option vs WP-Cleanup