So far, we've only had a few requests per year. Polishing Prism for Linux would take dozens of person-years of effort. Prism is a very interactive program, and all parts of the user interface would need to get rebuilt for a new platform, as would Prism's interaction with printers and the clipboard. Right now, we have no plans to port Prism or InStat to Linux. Because Mac OSX is based on Unix, it seems as though porting to Linux, another flavor of Unix, ought to be easy.
No plans to create a Linux version of Prism or InStat