Here is a list of WordPress multisite plugins I have found up until now.
This post will be updated as I find other good multisite plugins.
– Shared media across network:
https://wordpress.org/plugins/network-shared-media/ and https://github.com/johnbillion/network-media-library
– Additional options to the toolbar. Create also your own toolbar menu.
– This plugin can be used to register new users to all sites (one will also see the sub sites listed in the site drop down menu top left):
– An easier way to join a multisite.
– Automatically re-publishes blogposts to Facebook, Twitter, Google+, Pinterest, LinkedIn…
An easy way to find multisite – network plugins is to add new plugin and search for network or multisite.
– Shared/different login information across sites. Still looking for plugin…
From plugin text: “When you work quite a bit with WordPress Multisites, sometimes you need more informations or menu items. This plugin enhance the network area for super admins with useful functions.”
Clones an existing site into a new one in a multisite installation : copies all the posts, settings and files
An older plugin to learn from:
jgwebdevelopment.com: WordPress multi site enabler plugin
The plugin Duplicator (the Pro version works even better) also works with a multisite. One can backup the whole network with this plugin.
WordPress Multisite plugin search on Github
A list of Multisite plugins at wpmudev
A list of multisite plugins at Elegant themes
Another list at Design Wall