Includes arithmetic, mortgage and currency exchange processing features. Uses a dialog box and icons for input.
http://www.calcexpress.com/
Includes arithmetic, square root, exponent, natural log, trigonometry functions. Also, has parenthesis and memory features.
http://members.tripod.com/~rwedge/calculator.html
AddsUp the new way to calculate.
http://www.addsup.net
Combined archive and portal to web resources, educational issues, help forums, mailing lists, and teaching materials.
http://mathforum.org/
Free download big integer numbers calculator.
http://www.bigcalc.scriptmania.com/
Evaluates mathematical expressions involving multiple variables. Offers product description, screen shots and user guide.
http://www.mathbay.com/products/mathexp/
Calculator with scrolling tape display.
http://www.showcalc.com/
Graphing calculator. Includes matrix editor and unit conversions.
http://www.linesofcomm.demon.co.uk/