THE Equation Solver (EES) has the basic function of solving a set of algebraic equations, including nonlinear equations, differential equations and equations with complex variables. This program is also capable of performing optimizations, obtaining linear and nonlinear regressions, generating high-quality graphics for publications, simplifying uncertainty analyses and making animations.

THE EES It was developed to run on any version of the Windows operating system, both 32 and 64 bits, and can be used on Linux and Macintosh operating systems through emulator programs.

THE F-Chart is an authoritative solar system analysis and design program written by S.A. Klein and W.A. Beckman, the creators of the F-Chart method.