レール用の単語クラウドジェネレータ

Question

wordle.net ？

Answer 1

Why does it have to be a Ruby/Rails library?

You could use JQCloud, which is a nice JQuery plugin to build word and tag clouds.

Answer 2

Have you looked at heatmap? There's also a nice blog post explaining it:

http://www.idolhands.com/ruby-on-rails/guides-tips-and-tutorials/creating-a-heatmap-or-tag-cloud-in-rails