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An Excel add-in for automatic construction and management of complex formula.

Firenes is a good Firefox add-on

Read and add reviews of any website.

Outlook add-on that lets your email recipients chat with you instantly

Greeble lets you add random detail to your projects.

Speller is designed for Delphi: Add spell check capability to any application.

able to add automatic social bookmarking tags in your blog posts

It add support for audio files tag formats into Windows Media Player 10.

Blue Frog Firefox add-on fights spam in your Gmail, Hotmail and Yahoo mailbox.

Or add this gadget to your iGoogle page.