Sanitize is an allowlist-based HTML and CSS sanitizer. It removes all HTML and/or CSS from a string except the elements, attributes, and properties you choose to allow.

jaro_winkler is an implementation of Jaro-Winkler \ distance algorithm which is written in C extension and will fallback to pure \ Ruby version in platforms other than MRI/KRI like JRuby or Rubinius. Both of \ C and Ruby implementation support any kind of string encoding, such as \ UTF-8, EUC-JP, Big5, etc.

Numerizer is a gem to help with parsing numbers in natural language from strings (ex forty two). It was extracted from the awesome Chronic gem http://github.com/evaryont/chronic.

The lucky ruby gem to identify and convert strings from any letter case to another