Plugins

WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.

Automatically add users to peer blogs in a multisite network.

Simply add widgets in order to link another blog in a multisite instance

This plugin adds a coffee cup ratio widget to: Appearance > Widgets

Adds some Multisite-specific functions to WordPress' XML-RPC interface.

Provides a simple method to add one or more sliders to your website.

Enable multislot business hours / multislot opening and closing times for each workday for your vendor store with this plugin.

Use multiple SMTP servers to send WordPress emails (wp_mail())

This plugin use social profile image to creating a favicon from social site like G+, MSN Live, Twitter, Friendfeed, Facebook and Gravatar.

A MultiStep Checkout plugin for WooCommerce.