rubular - A ruby based regular expression editor
The Ultimate Productivity Stack - Curated directory of tools to supercharge your productivity
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Productivity Tools by Dropbox - Scan, share, collaborate & provide feedback on your ideas
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.
Treat - Improve your diet and fight back against disease