GitHub Metrics - Customize your profile with various plugins and metrics
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
GitHub Contributions - All your GitHub contributions in one image
rubular - A ruby based regular expression editor
GitWrapped - View/Share how you contributed to Github over the years
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.