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There are many power system simulation software tools for transient stability analysis that are commercially available today. The choice of the most adequate tool for a specific type of stability analysis is a difficult task, and is influenced by economical reasons. It is imperative that a comparative study of various tools be carried out to help users make informed decisions. This work evaluates DIgSILENT, PSS/E and PSCAD, which are commercial software tools used for digital simulation of power systems. As criteria for software assessment, the following features are investigated: (i) modelling capabilities - synchronous generator, generator saturation, transmission line representation, and external network, (ii) flexibility allowed to the user. A well known benchmark power system model from literature is used to validate the simulation results of the commercial tools.