Wants to truncate an HTML string properly? This Ruby gem is for you.
Test your rendered HTML files to make sure they're accurate.
DataMapper plugin for automated/configurable user input sanitization.
An interface for generating HTML tables with Ruby, with some rules enforcement
Got any useful tips about rails/rails-html-sanitizer?
... I send out a list of most interesting libraries and apps in the "Rails" section to about 1100 subscribers.
Do you want it too?