LINK
Publisher McGraw-Hill
Publisher of the book Portfolio Management that derives Digital Portfolio Theory available from PSS.
Software LINDO Systems
PSS Rel 2.0 requires the WhatsBest! LP optimizer by Lindo Systems.
  Frontline Systems

PSS Rel 3.0 requires the built in Excel Solver by Frontline Systems

Spread Sheet Lotus

PSS Rel 2.0 is compatible with Lotus 1-2-3 spreadsheet software.
  Excel
An Excel version of PSS (Release 3.0) is under construction.
Database
 Standard & Poor's COMPUSTAT
PSS Rel 2.0 is compatible with the S&P COMPUSTAT data base to interface market and accounting time series data.