tiredofit

Allows you to randomly visit a blog in your multisite network by appending ?randomblog at the end of your URL string. 
You can exclude by blog ID, mature or public status, and even change the string to whatever you like. 
View a working demo at <a href="http://www.bicycletouringhub.com?randomblog" rel="nofollow ugc">http://www.bicycletouringhub.com?randomblog</a>
<h3>Contact and Credits</h3>
Written by Dave Conroy (<a href="http://www.tiredofit.ca/?ms-random-blog" rel="nofollow ugc">www.tiredofit.ca</a>, e-mail ‘dave’ at ‘tiredofit dot ca’), 2012-02. 
Written inside of a tent while he bicycles the world for <a href="http://www.bicycletouringhub.com" rel="nofollow ugc">www.bicycletouringhub.com</a>

Multisite Random Blog Redirect

Allows you to randomly visit a blog in your multisite network by appending ?randomblog at the end of your URL string.

milordk

en: “Cloud” groups and users of your social network with highly customizable display 
You have a lot of communities? Want to show users a maximum of groups? Install this widget!
ru: “Облако” групп и пользователей Вашей социальной сети с широкими возможностями настройки отображения 
У Вас множество групп и/или пользователей? Множество блогов (сообществ)? Хотите показать пользователям максимум групп и/или блогов? Установить этот виджет!
Live demo: <a href="http://sportactions.ru" rel="nofollow ugc">Sportactions site</a>, <a href="http://volks-wagen-club.ru" rel="nofollow ugc">VW Club site</a>, <a href="http://jes.milordk.ru" rel="nofollow ugc">JES DEV site</a>
!!! For Buddypress 1.1.x, 1.2.1,2,3,4 : <a href="https://wordpress.org/extend/plugins/jet-group-could/" rel="ugc">Jet Groups Could</a> and <a href="https://wordpress.org/extend/plugins/jet-member-could/" rel="ugc">Jet Members Could</a>
<h3>Contact</h3>
For suggestions, bugs, hugs and love can be donated at the following locations.
<a href="http://milordk.ru" rel="nofollow ugc">Authors page</a>
<a href="http://milordk.ru/r-lichnoe/opyt/cms/jet-site-unit-could-poleznye-vidzhety-dlya-vashej-socialnoj-seti.html" rel="nofollow ugc">Plugin page</a>

Jet Site Unit Could Widgets

Provides random members and/or groups avatar list + blog list with more options /Widget/

Multisite Random Blog Redirect vs Jet Site Unit Could Widgets