rubular - A ruby based regular expression editor
Regex Crossword - Welcome to the fantastic world of nerdy regex fun!
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Nomo FOMO - Get notified when travel plans overlap with your friends
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.
Crossroad - Don’t chase after your friends’ pictures anymore