Why and some tips on how.
"A library for automatic detection of layout bugs in web pages"
software version control visualization tool
"A fully automated, active web application security reconnaissance tool."
"What your browser does when you look away..."
check how a website is rendered by Internet Explorer 7, 6 or 5.5
a JavaScript regular expression tester
"To collaborate in a distributed development process you’ll need to push code to remotely accessible repositories."
a 5min course to get started with Git and git-svn