Fully featured version of 1-Calc for your PC.
18 new cool skins for the PC & Pocket PC versions.
If you like 1-Calc, you'll love the 1-Calc Expansion Pack. Get the same great functionality of 1-Calc on your desktop or laptop PC - just a click away on your PC's system tray
Free42 is a complete re-implementation of the HP-42S calculator and the HP-82240 printer.
Free42 was written from scratch, without using any HP code. You do not need any ROM images in order to use it, yet it is fully HP-42S compatible