I am promoting a computer program that solves material balances (FastBalance). With its novel solution approach, it has features not available in most commercial programs and also, much simpler to use. I am firmly convinced that FastBalance should be used in conjunction with formal classroom instructions on material balances. FastBalance eliminates the tedious effort the chemical engineer goes though in specifying and manually solving material balance problems.
A free evaluation copy can be obtained from the following site (go to Acquire tab):
Additional information on material balance solution methodologies can be found on my LinkedIn site.