Eigenvalues of a power system can explain the system stability in its operating point. In this paper the linear analysis capabilities of two software packages are evaluated and compared. The paper also illustrates the impact of the models of the power system components on the location of the eigenvalues. Eigenvalue analyses are not only dependent on the properties of the investigated system, but also on the software package that is used, as well as on how the components of the power system are modeled. Therefore, conclusions can differ when studying the same power system with different software packages.