Usability is a fundamental characteristic for the success of an interactive system. It is a concept that includes a set of metrics and methods for users to obtain easy-to-use and easy-to-learn systems. On the one hand, Usability Evaluation Methods - UEM are quite diverse, and for that reason the selection of a method, or combination of methods, to evaluate the usability of an interactive system is not a simple task. On the other hand, the literature provides descriptions about the usability evaluation process. In that sense, this paper presents the software tool called ECUSI - Usability Collaborative Evaluation of Interactive Systems, which aims to support the implementation of activities that make a set of UEM. ECUSI is intended to be helpful for usability evaluators of interactive software systems.