ChemSep is a suite of programs for performing multicomponent separation process calculations on PC's. But it is much more than that: it contains ChemProp which can visualize fluid phase equilibria as well as physical properties, ChemLib to manipulate pure component data, and a simple flowsheeting program to solve small flowsheets. It has lots of graphical output to quickly understand the simulation results but also facilitates tabular output that can be edited into the required format.