rfair404

This plugin makes it possible to have a menu that is controlled by the primary site but used throughout all other sites in the network.
<ul>
<li>When a navigation menu position has no menu assigned, the “fallback” defaults to pages. This plugin over-rides that so that instead it uses the nav menu from the “main site” (site ID 1)</li>
</ul>

Network Menu Fallback

Gives multisite administrators the ability to create menus that can be used throughout a network.

Goran Petrovic

This utility plugin allow you to bookmark your site in admin bar.
This plugin is very useful if you have several, local or online, WordPress instalations.You can set up all sites admin bar, from one point.
So, you can jump fast from WP admin to WP admin.
Features
<ul>
<li>Fast jump from WP to WP </li>
<li>Global register sites</li>
</ul>

Network Menu Fallback vs WP Jump