Here is a description of EES:

EES (pronounced 'ease') is an acronym for Engineering Equation Solver. The basic function provided by EES is the solution of a set of algebraic equations. EES can efficiently solve thousands of coupled non-linear algebraic equations. EES can also be used to solve initial value differential equations. EES provides publication-quality plots, linear and non-linear regression, optimization, unit conversion and consistency checking, and uncertainty analyses. Built-in functions are provided for thermodynamic and transport properties of many substances, including steam, air, refrigerants, cryogenic fluids, JANAF table gases, hydrocarbons and psychrometrics. Additional property data can be added. EES also allows user-written functions, procedures, modules, and tabular data.

EES can be downloaded to a personal computer from the EES Information Website. The instructions for how to do this can also be found on the College of Engineering EES website. 

EES can also be accessed on CAE lab machines or through XENAPP. Instructions on how to access and use XENAPP can be found at https://kb.wisc.edu/cae/110906".