The mairn-mpm-fea computational mechanics package is written to do material point method calculations and finite element analysis on any platform. The source code is open source. There are various visualization options.
This project has recent been migrated to google code. To read about the project and to get the latest version of the source code (or prior stable versions), please visit the nairn-mpm-fea project home page on google code.
For information not covered on this web site, contact John.Nairn@oregonstate.edu.