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>> X-Ray Goggles allow you to see the building blocks that make up websites on the internet. >> Appmaker is a free tool for creating personal mobile apps, even if you don't know code! >> Popcorn Maker helps you easily remix web video, audio and images into cool mashups that you can embed on other websites. >> Thimble makes it ridiculously simple to create and share your own web pages.

Facette is a suite of tools allows Delicious users to organize their bookmarks using facets. Facette offers a bookmarks browser that automatically organizes tags in a user's account. Facette also offers an enhanced version of Delicious' tagging tool. Firefox plugin required

CodeBurner makes valuable reference material for HTML and CSS available right in your browser. CodeBurner is a suite of tools for web developers, that provides reference material for HTML and CSS, integrated with a range of popular development environments. 1Install CodeBurner 2Type an HTML element or CSS property in the Search field, or click an item on the page 3View browser compatibility info, syntax, code samples and more

Ten of the most popular Firefox add-ons to revolutionize the way you search the Web.

list.it is a simple, free, open-source note-keeping tool to help you manage the tons of little information bits you need to keep track of each day.

# Turn social bookmarking and page annotation into effective learning tools (for example by including peer-assessment features). # Allow users to easily compile personal e-portfolios (for example, by combining their own works - photos, comments, articles-with testimonials others have written about them). # Let the browser suggest relevant materials (for example, by automatically identifying additional articles based on what sites a person visit or which topics they search for). # Support social learning communities (for example, by making it easy to find and connect with others who share similar learning interests).

With the power of the underlying Mozilla Gecko engine, Pencil turns your excellent Firefox 3 browser into a sketching tool with just a 400-kilobyte installation package.

The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.

Collect data from web pages, PDFs, Word Documents and other resources. Index all of this data in a searchable, browsable database. Tagging of Entries makes pinpoint filtering easy. Filter your data by the Entry's source domain name. Search your data by keyword or phrase. RSS: Use an RSS reader to keep track of your most recent Entries or any tag based lookups into your data. Collaborate: Give colleagues access to your research data, with restrictions based on tags or keyword searches.

In my opinion, Xenocode Browsers is the ultimat tool for checking your website in different browsers. Xenocode Browsers allow you to lauch IE6, IE7, IE8, Firefox 2, Firefox 3, Google Chrome and Opera directly from the web. The only weak point: The service isn't available for Macs and GNU/Linux powered PCs.

Empower GMail, Google Mail & Google Apps emails with dynamic email signatures. Add Twitter, Facebook, Google Profiles and many more. Multiple HTML signatures support.

Probably another "must have" that you missed.