The latest release of XCALC is version 2.9.3. This is a small bugfix.
I have only tested this version on Win XP pro, but I assume it works well with any version of Windows upwards from 98 or 2000. I believe that neither NT4 nor Win95 will do any more. Wine (under Linux) works mostly quite well, but read the bugs section under online help (admittedly a Little difficult, since the main problem is help support).
If you have any queries, praise, complaints or whatever, do drop me a line. You'll find a clickable item in the XCALC about Box. The only condition for your using XCALC is that you send me an email.
Porting XCALC?
I frequently receive requests for a port of XCALC to various platforms - Linux, Windows Mobile, Symbian... The answer is: NO I do not plan any ports. There was a project years ago for a native Linux port, but that stalled due to lack of interest, and I do not want to repeat that exercise. Sorry.