“Network Link Conditioner†utility lets you simulate internet and bandwidth conditions
CasperJS is a navigation scripting & testing utility for PhantomJS, written in Javascript
Skipfish is an active web application security reconnaissance tool. It prepares an interactive sitemap for the targeted site by carrying out a recursive crawl and dictionary-based probes. The resulting map is then annotated with the output from a number of active (but hopefully non-disruptive) security checks. The final report generated by the tool is meant to serve as a foundation for professional web application security assessments.
YAML Debug is ... ... an assistive tool for web developers, that allows you to quickly review code quality and semantic structure of any website (particularly those based on YAML) as well as testing it against common oversights. This tool is not intended to be a reliable test environment for the accessibility of websites!
Generate custom icon webfonts from the comfort of the command line.
Helium is a tool for discovering unused CSS across many pages on a web site. The tool is javascript-based and runs from the browser.
XHProf is a hierarchical profiler for PHP. It reports function-level call counts and inclusive and exclusive metrics such as wall (elapsed) time, CPU time and memory usage. A function's profile can be broken down by callers or callees. The raw data collection component is implemented in C as a PHP Zend extension called xhprof. XHProf has a simple HTML based user interface (written in PHP). The browser based UI for viewing profiler results makes it easy to view results or to share results with peers. A callgraph image view is also supported.
