Easily allow users to create new sites (blogs) at multiple different domains - using one install of WordPress Multisite you can support blogs at name.domain1.com, name.domain2.com etc. etc.

The most powerful, easy to use and flexible membership plugin for WordPress, Multisite and BuddyPress sites available. Offer downloads, posts, pages, forums and more to paid members.

Allows you to do a full import of a Ning network's users, their custom profile fields, and avatars to BuddyPress. Full support for very large member lists via optional FTP upload and batch processing.

This plugin allows you and your users to offer subscriptions to email notification of new posts - fully supported for WordPress, WPMU and BuddyPress and auto-imports all Subscribe2 users.

Allows you to display a fancy pop over (rather than a popup) to visitors sitewide or per blog, a *very* effective way of advertising a mailing list, special offer or running a plan old ad.

The ultimate plugin and service to stop and kill splogs in WordPress Multisite and BuddyPress

This key plugin lets you know when your WPMU DEV plugins and themes need to be updated, or when new versions with extra features are released... critical for security and functionality!

Advanced Theme Switcher allows BuddyPress and Multisite users the chance to switch between different themes, or you the opportunity to profile different theme designs on a BuddyPress or Multisite

Allows you to bulk create new users on a site and add them to a blog, including the facility to set their role and password on the new site.

Adds the ability for site admin to choose which BuddyPress widgets should *only be available to the main blog*.

BuddyPress Group Email

This plugin allows you to maintain, update and share upcoming (and past) group events with really swish calendar functionality... plus widgets that display a list of all upcoming events!

The ultimate domain mapping plugin - allows multiple domain mapping on subdomain AND subdirectory installs, handles cross-domain cookie syncing and integrates with Supporter paid upgrades!

Limit who can sign up for a blog or user account at your site by requiring a special code that you can easily configure yourself

Would you like to be able to change any wording, anywhere in the entire admin area on your whole site? Without a single hack? Well, if that's the case then this plugin is for you!

Simply insert any code that you like into the footer of every blog via Site Admin > Options... works great for stats, in text advertising, popovers and more!

Create hundred or thousands of blogs and users automatically by simply uploading a csv text file - subdomain and user creation automation has never been so easy.

When a new users signs up at your site, you want to welcome them, and this plugin allows you to do that extra well by sending automatic welcome emails for several days after they have joined.

The blog and user creator plugin is an amazing powerful feature that allows you, and your users, to batch create gazillions of blogs and/or users while setting passwords, urls, titles and more!

Simply integrate MailChimp with your Multisite (or regular old single user WP) site - automatically add new users to your email lists and import all your existing users

A widget that shows recent posts from all the blogs across your entire Multisite installation - hugely powerful and massively configurable!

Display all the latest comments from across your entire WordPress Multisite network - using a simple but powerful widget!

It's great to offer your users Google Analytics, but it's even better to be able to offer it to individual bloggers AND at the same time capture sitewide stats for yourself!

Create your own blog network with upgrades, like WordPress.com or Edublogs.org, offering your users premium themes, premium plugins, extra storage, advertising, domain mapping and more.

Displays post and comment activity per blog and per user

Easily add a widget full of custom content to user dashboards, great for help and support... or sales messages!

Easily customize the order of widgets on all of your users dashboards... giving more prominence to the widgets *you* want them to see and use

Allows you to send emails to all users via defined mailing lists. Users also have the option to unsubscribe from the mailing list.

This is a simple plugin that makes it easier to place a message in the admin panels that all users will see

This is a simple plugin that makes it easier to place a message in the admin panels that all users will see

Collects user activity data and makes it available via a tab under the Site Admin

Allows you to scale your standard Multisite install to allow for millions of blogs... also will vastly improve the performance of your site!