Our website provides a free download of REFPROP 9.1. The program lies within Development Tools, more precisely Database Tools. This software was originally produced by NIST.
From the developer:
This program calculates the thermodynamic and transport properties of industrially-important fluids and their mixtures. These properties can be displayed in tables and plots through the graphical user interface; they are also accessible through spreadsheets or user-written applications accessing the REFPROP DLL or the FORTRAN property subroutines.
You may want to check out more software, such as MySQL Workbench, SQL Packager or IB Expert, which might be related to REFPROP.