Private Notes on Each Network Site
Adds a "Notes" box to Network Admin > Sites > Edit Site where super admins can record the client, contract details or quirks of a site, and shows the note in the sites list.
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.