Ravel the program is a commercial data analysis extension to the Open Source system dynamics program Minsky. It inherits all of Minsky's features and adds the RavelTM, a graphical object for the manipulation and analysis of multidimensional data. If you are using Minsky and would like to check out Ravel, go to Ravel's Patreon page and sign up. The monthly fee is US$7, and there is a 7-day trial period during which you can experiment with using Ravel before the fee is applied.