Valuesoft is a suite of 30 functions to calculate the value of stocks: dividend discount, free cash flow, payback, expected return and much more. It incorporates methods of of Benjamin Graham, John Burr Williams, Warren Buffett, Robert Wiese, Joel Greenblatt, James Tobin, William O'Neill, Maynard Keynes, James Ohlson, Bruce Greenwald, Kenneth Lee, Robert Haugen and others.
The key methods are described in detail in the book "The Conscious Investor" by John Price