Tipster v2.1 is a great freeware application for calculating gratuity and sales tax. Sure, you could do the math in your head, but why not get a cool mobile application to do it for you? When you're dining with friends or shopping in another state, having a sales tax and gratuity calculator can actually save time and help you keep accurate records.
EZQuote Estimator allows you to easily create estimates and job quotations on-the-spot and is ideal for estimators, construction contractors, landscapers, builders, handymen, insurance adjusters and similar professions. 
Panoramic Calc Pro gives Windows Mobile devices and smartphones nine powerful calculators plus 10 additional financial calculators, enabling the user to perform any standard or advanced operations.
Available for free and for a limited time only, PCalc Lite is a fully functional scientific calculator for the iPhone and iPod Touch. 
Panoramic Calc Pro gives Windows Mobile users access to 10 powerful calculators and 10 additional financial calculators, making it perhaps the top choice to replace your default smartphone calculator. 
cCalc is a scientific application for Symbian devices which will let you use all the scientific functions of a regular scientific calculator on most Symbian handsets. But the application failed to work on the new E71smartphone from Nokia. That's where cCalcPro comes in place. It's a special version made for the QWERTY keyboard of the E71.
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