thenbrent

Running a WordPress network? You no longer need to manually add new users to each of your sites.
With this plugin, users are assigned a default role for each of your sites. You set the default role for each site and this plugin applies it.
You can assign different roles for each site or keep a site private by assigning no role.

Multisite User Management

Automatically add users to each site in your WordPress network.

artilibere

Network Blog Manager aspire to be the perfect companion of every Super Administrator of a WP Blog’s Network.
With Network Blog Manager you can find easily every blog in your network due an internal search engine. 
Then you can contact the administrator and have a quick overlook of the number of contents (posts, pages, comments) each blog has.
Extensible with an internal plugin support: you can build your own functionality!
<h3>Features</h3>
Briefly:
<ul>
<li>Ideal companion for Super Admin </li>
<li>Internal Search Engine for Blog’s Networks</li>
<li>Quick Overlook of Multisite’s Instances</li>
<li>Useful SEO Stats: Google and Alexa Ranks, Sites linking in, Average Load Time, Yahoo! Site Links</li>
</ul>

Network Blog Manager

A simple but powerful blog manager to be used in blog networks. Include an internal search engine, statistics, and some useful tool.

Multisite User Management vs Network Blog Manager