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» LaTeX Equation Editor : The interactive LaTex equation editor let's you write and download equations in seconds! You can now integrate the sitmo equation editor with iGoogle or your own site. » Online Option Calculators : The largest collection of online exotic option calculators.» Equations :  The Quant Equation Archive is an continously growing collection of the most important equations used in financial engineering.

backstitch is a personal web experience that aggregates content from your favorite websites and services into a consistent user interface. Unlike other 'data aggregators' backstitch translates information into descriptive formats such as articles, photos, and products. With this common format backstitch is able to provide a consistent experience (regardless of source) as well as allow for detailed personalization such location search, price limits, and social filtering.

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online and webpage spell checker with:  save as txt file, print, upper/lower case convert, text statistics