3. JsDoc Toolkit
It is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and “fiddle” with incoming or outgoing data.
6. Tamperdata – Firefox Extension
View and modify HTTP/HTTPS headers and post parameters, trace and time http response/requests and security test web applications by modifying POST parameters.
9. YUI Compressor
10. JS Minifier
Code is pre-filled with an example.
Does a straighforward whitespace/comment crunching and a more fundamental transformation, aka compression.