RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.

Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.

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.

Just Not Sorry - Highlight 'weak' words so you can edit them out

rubular - A ruby based regular expression editor

Hemingway - Hemingway App makes your writing bold and clear.