What is the Linux equivalent of Fiddler? [closed]

On Windows I like using Fiddler to scan TCP streams and save them.

Is there a similar tool to do this under Linux?

Wireshark is network protocol analyzer and is available for Linux, PC and Mac. Like fiddler it allows you to scan TCP streams and allows deep inspection of hundreds of protocols. Please take a look at features in the about page.

Check out Charles - it runs on Linux as well.

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 and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).