Kevon Adonis

This plugin adds a universal top menu among WordPress sister websites. 
Administrators may manage menus from one central location (a master site) and use the client plugin (pending) on remaining sites to display the menus. 
Or simply add the master menu to all sites that needs the top menu. 
Create as many menus as you like. If you are using the client plugin to display the menus 
on sisters sites you first need to add that site to the list of menus first on the master site. 
After creating your menus choose from ten (10) color themes under settings and you’re all set to go.
Please feel free to request more themes and features (email @ kevonadonis.com )

WP Group Menu

This plugin adds a universal top menu among WordPress sister websites.

kodeala

Reorder Multisite Sites Dropdown gives WordPress Multisite administrators a powerful tool to organize the My Sites dropdown in the WordPress Admin Bar. With this plugin, you can customize how sites appear in the admin bar so they are easier to find and better organized for your workflow. It is especially useful for WordPress Multisite networks with many sites where the default alphabetical ordering becomes difficult to manage, enhancing the existing WordPress multisite admin bar experience without modifying WordPress core functionality.
With this plugin, you can:
<ul>
<li>Reorder sites in the My Sites dropdown using drag-and-drop.</li>
<li>Manually set ordering using number input fields for quick repositioning.</li>
<li>Create groups to organize related sites together.</li>
<li>Add divider lines to visually separate sections.</li>
<li>Nest sites inside groups for better structure.</li>
</ul>
The ordering interface is available in the Network Admin under Settings > Reorder My Sites

Reorder Multisite Sites Dropdown

Adds advanced ordering controls to the WordPress Multisite My Sites admin bar dropdown, allowing administrators to organize sites with drag-and-drop,  …

WP Group Menu vs Reorder Multisite Sites Dropdown