regex101 : Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
Git Reference : This is the Git reference site. It is meant to be a quick reference for learning and remembering the most important and commonly used Git commands.
HTML5 Cross Browser Polyfills : So here we're collecting all the shims, fallbacks, and polyfills in order to implant html5 functionality in browsers that don't natively support them.
Beekeeper Studio : Open Source cross-platform SQL Editor and Database Manager. Use Beekeeper Studio to query and manage your relational databases, like MySQL, Postgres, ...