New Theme and Plugin Visibility Manager for WordPress Multisite
A new pair of plugins are available that enable WordPress Multisite administrators to control the visibility of plugins and themes. The Theme Visibility Manager allows super admins to control which themes are visible to admins of a given site within a Multisite network. Themes can be made hidden or visible on a site by site basis through the themes menu or on a site-wide basis through the ‘Theme Visibility Manager’ page in the super admin menu.
The Plugin Visibility Manager does the exact same thing, except for plugins. Download both to add more specific control over plugins and themes in your Multisite network.