Hide New Network Sites From Search Engines
Sets every newly created site to "Discourage search engines" so half-built sites are not indexed; site owners switch it off when they launch.
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.
Noindex Subsites With a Staging Path
Adds a noindex robots directive to any subsite whose address contains "staging", "dev" or "test", so preview copies inside a network never show up in search results.