rubular - A ruby based regular expression editor
Hexmos - Friendly Software to Uplift Team & Individual Capabilities
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
What the Chef!? - Make your own recipe, just start with the ingredients.
RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.
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.