The 6.0 version of RPNBigFloat for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software is categorized as Education Tools. This free software for Mac OS X was originally created by Stephan Jancar. We recommend checking the downloaded files with any free antivirus.
From the developer:
RPN Big Float Calculator is an accurate calculator with precision from 16-bit up to 100.000. The utility supports fast calculation in RPN-Mode or direct formula input. The tool provides lots of functions up to elliptic integrals, theta-functions, gamma and log gamma, built-in constants for gamma, pi, and Feigenbaum, calculation mode for complex numbers, quaternions, integers and p-adic numbers, and nerdy functions with Klingon user-Interface.
You may want to check out more Mac applications, such as Genealogy Pro, Analytics to Earth or TreeView X, which might be related to RPNBigFloat.