PolyCalc is a quickly extendable and programmable calculator with keyboard layouts for different purposes. At download PolyCalc includes two built-in keyboard layouts: a simple and a scientific keyboard layout. In addition further keyboard layouts can be downloaded from the online PolyCalc gallery. The downloaded keyboard layouts can be installed simply by copying the file to the appropriate directory. The PolyCalc files describing keyboard layouts are in XML format. PolyCalc is a free and open source software download from illusions.hu. PolyCalc is licensed under GPLv3.