"A library for automatic detection of layout bugs in web pages"
software version control visualization tool
Slide Shows in HTML and XHTML
"What your browser does when you look away..."
check how a website is rendered by Internet Explorer 7, 6 or 5.5
"Simple library which makes it easy to add caching to all your external API calls."
"Allows you to upload files using HTML5 Gears, Silverlight, Flash, BrowserPlus or normal forms, providing some unique features such as upload progress, image resizing and chunked uploads."
a JavaScript regular expression tester