Here are 118 plugins which are sold on WPMU.
Could not give detailed information for each one but if you check them on their website you’ll find information.
Also I downloaded this from somewhere else, and I did not try these plugins yet.
Here is the list…

Code:

wpmudev-admin-help-content-1.0.5                     
wpmudev-ab-theme-testing-1.0.2                       
wpmudev-add-existing-users-1.1.1                     
wpmudev-add-new-users-1.0.7                          
wpmudev-admin-ads-1.0.9                              
wpmudev-admin-footer-text-1.0.8                      
wpmudev-admin-message-1.1.1                          
wpmudev-admin-panel-tips-1.0.4                       
wpmudev-ad-sharing-1.2                               
wpmudev-advanced-theme-switcher-1.0.4                
wpmudev-ad-widget-2.1.1                              
wpmudev-autoblog-3.6.2                               
wpmudev-automatic-follow-up-emails-for-new-users-2.0.
wpmudev-avatars-3.5.6                                
wpmudev-batch-create-1.2.3                           
wpmudev-bbpress-sitemaps-1.0.1                       
wpmudev-blog-and-user-creator-2                      
wpmudev-blogs-directory-1.1.6                        
wpmudev-blogs-widget-1.0.6                           
wpmudev-blog-types-2.0.7                             
wpmudev-buddypress-group-calendar-1.2.8              
wpmudev-buddypress-group-email-1.0.5                 
wpmudev-buddypress-hide-widgets-1.0.3                
wpmudev-classifieds-2.1                              
wpmudev-comment-form-text-1.0.2                      
wpmudev-comment-indexer-1.0.8                        
wpmudev-comment-spam-pack-2.0.1                      
wpmudev-comments-plus-1.2                            
wpmudev-communities-1.1.7                            
wpmudev-contact-widget-1.3.1                         
wpmudev-content-monitor-1.2.2                        
wpmudev-custom-admin-bar-1.2.1                       
wpmudev-custom-content-dashboard-widget-1.6.1        
wpmudev-custom-google-search-1.0.1                   
wpmudev-custompress-1.1.8                            
wpmudev-dashboard-feeds-1.5.2                        
wpmudev-dashboard-widget-order-2.0.4                 
wpmudev-default-theme-1.0.3                          
wpmudev-domain-mapping-3.0.5                         
wpmudev-easy-blogging-3.1.4                          
wpmudev-e-commerce-2.3.2                             
wpmudev-e-newsletter-1.1.4                           
wpmudev-floating-social-1.3.4                        
wpmudev-footer-content-1.0.2                         
wpmudev-forums-1.7.1                                 
wpmudev-friends-1.1.7                                
wpmudev-global-footer-content-1.0.2                  
wpmudev-global-site-search-2.1.1                     
wpmudev-global-site-tags-2.1.2                       
wpmudev-google-1-1.3.2                               
wpmudev-google-analytics-2                           
wpmudev-in-post-ads-1.2                              
wpmudev-invite-1.1.2                                 
wpmudev-lock-posts-1.0.2                             
wpmudev-login-image-1.0.9.1                          
wpmudev-login-redirect-1.0.3                         
wpmudev-logout-redirect-1.0.3                        
wpmudev-mailchimp-newsletter-integration-1.1.2       
wpmudev-mass-email-sender-1.6                        
wpmudev-media-embeds-for-buddypress-activity-1.3.1   
wpmudev-members-directory-1.0.8                      
wpmudev-membership-2.1.3                             
wpmudev-messaging-1.1.2                              
wpmudev-moderation-1.0.6                             
wpmudev-multi-db-3.1.2                               
wpmudev-multi-domains-1.1.5                          
wpmudev-new-blog-template-1.3                        
wpmudev-ning-to-buddypress-user-importer-1.0.5       
wpmudev-password-protect-selected-content-1          
wpmudev-pay-to-blog-1.5.7                            
wpmudev-post-indexer-2.1                             
wpmudev-post-voting-plugin-2.1.3                     
WPMUdev-Pro-Sites-3.0.4.1                            
wpmudev-qa-wordpress-questions-and-answers-plugin-1.0
wpmudev-quick-status-1.3                             
wpmudev-random-theme-on-signup-1.0.1                 
wpmudev-rebranded-meta-widget-1.0.2                  
wpmudev-recent-comments-1.0.2                        
wpmudev-recent-custom-posts-type-widget-1.2          
wpmudev-recent-global-author-posts-feed-2.3          
wpmudev-recent-global-comments-feed-1.0.6            
wpmudev-recent-global-comments-widget-1.0.4          
wpmudev-recent-global-posts-feed-2.2                 
wpmudev-recent-global-posts-widget-2.1               
wpmudev-recent-posts-2.1                             
wpmudev-remember-me-checked-1.0.1                    
wpmudev-remove-email-verification-from-signup-2      
wpmudev-remove-permalinks-menu-item-1.0.3            
wpmudev-remove-wordpress-dashboard-widgets-1.0.3     
wpmudev-reports-1.0.5                                
wpmudev-scheduled-content-1                          
wpmudev-select-language-at-signup-1.0.4              
wpmu-dev-seo-1.3.5                                   
wpmudev-set-blog-description-on-blog-creation-1.0.2  
wpmudev-set-password-on-wordpress-mu-blog-creation-1.
wpmudev-signup-code-1.0.3                            
wpmudev-simple-ads-1.0.3                             
wpmudev-site-generator-replacement-1.0.2             
wpmudev-sitemaps-and-seo-wordpress-mu-style-1.0.4    
wpmudev-sitewide-privacy-options-for-wordpress-mu-1.0
wpmudev-site-wide-text-change-2.0.3.1                
wpmudev-subscribe-by-email-1.1                       
wpmudev-support-system-1.7                           
wpmudev-tag-feed-2.1.1                               
wpmudev-terms-of-service-1.2.2                       
wpmudev-the-pop-over-plugin-3.0.2                    
wpmudev-ultimate-facebook-1.6                        
wpmudev-upgrades-1.4.5                               
wpmudev-upgrades-advertising-1.0.1                   
wpmudev-user-activity-1.0.4                          
wpmudev-users-widget-1.0.1                           
wpmudev-who-sees-ads-for-wpmu-2.0.5                  
wpmudev-wordpress-chat-plugin-1.0.7-BETA-6           
wpmudev-wordpress-directory-1.0.7                    
wpmudev-wordpress-google-maps-plugin-2.3.1           
wpmudev-wordpress-mu-affiliate-2.4.5                 
wpmudev-wordpress-user-synchronization-1-BETA-9      
wpmudev-wordpress-wiki-1.0.9-BETA-3 

There are 132 plugins featured on their website and I think 118 is a good number for free!
Also many of these plugins (which I installed) do not need activation so you can use these.

The products can be seen at here;

Code:

http://premium.wpmudev.org/wordpress-plugins/

The download link is;

Code:

http://www.multiupload.com/JE61HR5GJP

VT Scan Link;

Code:

http://www.virustotal.com/file-scan/report.html?id=81d5e2b2ffec7e3836a6bf86c923b48c194fedc2d9ba3d825e90c78b6d09dc11-1325854717

File name: PlUgInS.zip
Submission date: 2012-01-06 12:58:37 (UTC)
Current status: finished
Result: 1/ 38 (2.6% )

ClamAV 0.97.3.0 2012.01.06 PUA.Script.Packed-1 (Might be a false alarm)