PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.

A tool for quickly profiling variables and resources used by PHP.

Test and track your emails. Email previews, analytics and spam filter testing.

The JavaScript Code Quality Tool

Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de facto (and often de jure) standard across many industries and educational institutions.

A free web debugging tool

An HTTP Viewer and HTTP Sniffer for IE and Firefox

JavaScript Unit Testing for Firefox