the author of this app says:
Napier is a full-featured, programmable calculator with so many capabilities!
The program has 138 built-in functions and 64 conversions. The full version can be used to program in VBScript, and data files can be exchanged with other programs.
The Freeware version has no time limit or nagware, but it cannot save files or be programmed in VBScript. However, the trial version will have the functionality of the full version for 30 days. After that time, the freeware version will still work, but some features will be unavailable.