jQuery Plug-ins
              Bar Fly
              
              A flyweight bar chart plug-in for jQuery.  Bar Fly supports
              multiple data sets and can animate the transition between sets.
              Bar Fly is only 3 KB when minified.  It draws charts using only
              CSS so it can be used in browsers without Flash or Canvas support.
            
Ruby Gems
              RBing
              
              A gem that provides an interface to Microsoft's Bing search API.
            
Ruby on Rails Plug-ins
              Caching Mailer
              
              Enables the use of Rails' fragment caching in ActionMailer views.
            
              Database Counters
              
              A database performance logging plug-in for Ruby on Rails.
              It will record the number of database calls made and rows returned for each request.
            
              Testable Logger
              
              Ruby on Rails plug-in that allows testing of logging.
              It lets you assert that messages were (or were not)
              written to the application's log file during a test case.