Brajesh Singh

This is a plugin for wpmu/wpmu+byddypress powered websites, where network administrators can limit the number of blogs a user can signup. 
It is pretty simple and adds an option to NetworkAdmin->Dashboard->network settings page, where you can limit the number of blogs. No additional frills required.
What It does
It adds an option to the Network settings page when you are logged in as site admin of the wpmu site(or wpmu+buddyppress site),Look at the bottom of options page,and You will see a text box like this asking for number of blogs allowed per user.If you set it to zero(which is the default),It will not restrict the blog registration then. 
For any support or any questions,please leave a comment at my blog
<a href="http://buddydev.com/buddypress/limit-blogs-per-user-plugin-for-wpmu/" rel="nofollow ugc">http://buddydev.com/buddypress/limit-blogs-per-user-plugin-for-wpmu/</a> 
And yeh did I mention <a href="http://blog.strategy11.com/" rel="nofollow ugc">Steph</a> has been very kind in reporting bugs and suggesting fixes.Many Thanks to Steph.

Limit Blogs Per User

This plugin is for WordPress Multisite and/or WordPress Multisite+buddypress based social network.It limits the number of blogs a user can create.

Adadaa

This plugin creates four (4) seperate RSS 2.0 feeds from posts, comments, pages, and one combined [posts & pages] across all blogs on your site.
Works both on WPMS upto 4.9.20
This will skip the first comment and page of a blog; also will not include private, spam, mature and deleted blogs.
Both Subdirectory and VHOST installations are now supported. Thanks to DaryL.
Features:
<ul>
<li>Generates sitewide combined [posts & pages] feed</li>
<li>Generates sitewide posts feed</li>
<li>Generates sitewide comments feed</li>
<li>Generates sitewide pages feed</li>
<li>Client-side caching via ETag headers</li>
<li>Admin screen to configure options</li>
<li>Compliance with xhtml and xml standards & many more</li>
</ul>
For more explanation and to leave any suggestions to improve or bugs, please visit on my blog : <a href="http://1uthavi.adadaa.com/ada-wpmu-sitewide-feed-plugin/" rel="nofollow ugc">Ada WPMS Sitewide Feed</a>
<h3>Usage</h3>
Compatible with WP Multi-Network plugin . You can have different blog ID than 1 to trigger the full feed.
<h3>To Do</h3>
<ul>
<li>Comply fully for language translation</li>
<li>Exclude blogs by ID</li>
<li>Enable/disable individual sitewide feeds</li>
<li>Option to include the blog title in the post title shown in the feed</li>
<li>Consider changing the function ada_get_avatar_url() to use the core hook get_avatar(). So it can work with WPMUDEV’s Avatars for Multisite.</li>
<li>Option to exclude by post types</li>
</ul>

Ada WPMS Sitewide Feed

Creates four rss 2.0 feeds showing recent posts, comments, pages, and one combined [posts and pages] from all blogs.  Works both on WPMS, and WPMU

Limit Blogs Per User vs Ada WPMS Sitewide Feed