Kalculator is a free Yahoo! widget designed to behave very much like standard-issue pocket calculators. Kalculator includes trig, square root, exponent, logarithm and inverse functions. Controllable by mouse and keyboard. Some useful features are unit conversions, displays for memory content and repeated operations, hexidecimal display, and a minimized mode that snaps to screen edges. Click-and-hold on the number display for unit conversion, copy, hex, and donations.Requirements: