I am excited to let you know about a new search app for Ruby gems
http://www.rubygemsearch.com. Search results even include the
gems that do not have the search word in their name or description. One
can quickly find out canonical gems for any keyword/category using this
app. One can further drill down to a specific gem to see similar/related
gems and other useful resources like documentation/wiki and github urls,
screencasts etc. Below are few few sample searches. I hope you find it
useful.
http://www.rubygemsearch.com/ruby-gems/search?q=metrics
http://www.rubygemsearch.com/ruby-gems/search?q=authorization