Lock the Admin Email on Subsites
Makes the Administration Email Address field on each site's General Settings read-only for site admins, so network notices keep reaching the right person.
Snippet Library
Multisite snippets for WordPress
Snippets for WordPress Multisite networks: network-wide settings, new site defaults, super admin tools and cross-site tweaks. For network administrators who manage many sites from one install.
Network-Wide Dashboard Announcement
Adds an "Announcement" box to Network Admin > Settings; whatever a super admin writes there appears as a dismissible notice on every site's dashboard.
Remind Super Admins Which Site They Are Editing
Shows a slim coloured bar at the top of every subsite dashboard for super admins with the site's name and address, so changes are never made on the wrong site by mistake.
Warn Site Admins Before They Run Out of Upload Space
Shows an admin notice on the Media screens and the dashboard once a site has used more than a set share of its upload quota, before uploads start failing.