Lubos.motl
History 2
FreeOverride default history page with a user friendly one.
WindowsFrame two pages
FreeMerge last two tabs into a frameset.
WindowsA Big Calculator
FreeHave a calculator on the browser.
WindowsCurrency Exchange Rates
FreeGet U.S. currency rate related to other currencies and the price of gold.
WindowsYour Favorite Radio
FreePlay or stop Hitradio FM Plus or set any radio you like.
WindowsSitmo LaTeX equation editor
FreeProduce equations WYSIWYG, see the TeX source, and get the URL for the image.
Windows