Harshit

View/Export useful network statistics related to sites, users per site, plugins per site, themes and plugins for all the sites in a WordPress multisite network.
The features include –
<ol>
<li>Background processing for generating new statistics for the network. It allows you to safely generate stats without compromising the performance of your large multisite network.</li>
<li>Ability to fine tune batch processing settings.</li>
<li>Protected network admin settings.</li>
<li>Notification when the stats are available.</li>
<li>D3 Visualizations</li>
<li>Generates set of CSV files corresponding to different types of stats.</li>
</ol>

WP Network Stats

View/Export network statistics related to users & plugins per site, themes, plugins and other site stats in your multisite network.

Richard Vencu

This plugin creates and maintains one or multiple hierarchies of blogs in the WPMS network. Options screens appear in network admin dashboard. The blogs hierarchy can be used for several purposes such as:
<ol>
<li>consolidate posts (or latest posts) from descendant blogs only</li>
<li>display a list of descendant blogs or even a tree of blogs from any node</li>
</ol>
Other features
<ol>
<li>Hierarchy cannot loop (cannot set as parent one of the descendants or itself)</li>
<li>The main site (blog_id 1) cannot have a parent</li>
<li>Individual blogs may be taken out of hierarchy</li>
<li>Multiple independent hierarchies may be created 
Limitations: this plugin is not optimized for large installations. More than 50 blogs can be hard to manage.</li>
</ol>

Network Sites Hierarchy

This plugin creates and maintains one or multiple hierarchies of blogs in the WPMS network.

WP Network Stats vs Network Sites Hierarchy