Adam Harley (Kawauso)

A quick adaptation of the theme restriction code for widgets. Can only restrict on a site-wide basis, though it will only affect those sites on which it’s activated. Does not restrict super admins. Plugins must be active on the main site to be controlled by this plugin (this is an issue with WordPress’ plugin structure).
See also: <a href="https://wordpress.org/extend/plugins/restrict-multisite-plugins/" rel="ugc">Restrict Multisite Plugins</a>

Restrict Multisite Widgets

Allows network admins to restrict which widgets are available on sites, similar to themes.

Ryan Willis

This is a plugin for WordPress Multisite 3.0+ that restricts password changes or resets to super admins only. This is handy when user creation and authentication are handled from an external application and passwords should only be changed on one system.

Restrict Password Changes – MultiSite

Restricts multisite password changes to super admins only.

Restrict Multisite Widgets vs Restrict Password Changes – MultiSite