Just Not Sorry - Highlight 'weak' words so you can edit them out
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Boomerang Respondable - Write perfect emails with Artificial Intelligence
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
rubular - A ruby based regular expression editor
Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.