regex101 : Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
Go by Example : Go by Example is a hands-on introduction to Go using annotated example programs.
textfiles.com : What this site offers is a glimpse into the history of writers and artists bound by the 128 characters that the American Standard Code for Information...
Charles Web Debugging Proxy : Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine...