HTTP Archive : The HTTP Archive tracks how the Web is built.
REDbot : REDbot is lint for HTTP resources; it tests protocol correctness, cacheability, content negotiation and more. REDbot checks HTTP resources to see how ...
drest : Configurable HTTP/REST Client Library for Python
Selfspy : Selfspy is a daemon for Unix/X11 and (thanks to @ljos!) Mac OS X, that continuously monitors and stores what you are doing on your computer. This way,...
hurl.it : Hurl.it makes HTTP requests.
Choose the request method, customize headers and POST parameters, add basic authorization or OAuth credentials, and even ...