Activate a Default Theme on New Network Sites
Switches every newly created site to the theme you choose instead of the latest default theme.
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.
Active Theme Column in the Network Sites List
Shows the theme each site uses in Network Admin > Sites, so you know which sites a theme update or removal affects.
Theme Usage Report for the Network
Adds Network Admin > Themes > Usage, listing every installed theme with the sites that use it (directly or as a parent theme), so unused themes are easy to spot.