SkinCalc, which is completely free, features standard and advanced calculator functionality, a spreadsheet interface, and skins. Skins make it possible to change the layout and functionality of the software, with effects that include non-rectangular shapes, user-configurable transparency and alpha channel translucency. More than 100 skins are available from the sites listed at skincalc.com, which also has instructions to create your own skins.
Other software by Cloanto Corporation
Currency Server 4.5 Advanced currency information and conversion services for COM/ActiveX/.NET/SOAP
MenuBox 3.2 Create AutoRun CDs/DVDs and design professional menu windows (HTML or text)
WorldCalc 3.5 Calculator and currency converter with online exchange rate updates and skins.
Amiga Explorer 2005 Connect an Amiga with one or more PCs. Supports serial and TCP/IP connections.
Euro Calculator 3.5 Calculator and currency converter with online exchange rate updates and skins.