Calcoo is a scientific calculator designed to provide maximum usability. The features that make Calcoo better than (at least some) other calculator programs are: * Bitmapped button labels and display digits to improve readability. * No double-function buttons. * Undo/redo buttons. * Copy/paste interaction with X clipboard. * Both RPN (reverse Polish notation) and "standard" modes are available. * Tick marks to separate thousands. Below are the features that Calcoo lacks (but which are useless anyway): * Statistical mode. * HEX mode. WWW: http://calcoo.sourceforge.net/