The evaluation of dependability or performance of general systems is not a trivial task. Therefore, the assistance of software tools to obtain the wanted metrics is of utmost importance. This paper introduces the Mercury environment, which is an integrated software that enables creating and evaluating Reliability Block Diagrams, Stochastic Petri Nets, Continuous Time Markov Chains, and Energy Flow Models. Mercury provides graphical user interface for these modeling formalisms and a script language that allows using it through command-line interface and also integration with external applications. The set of features available in the Mercury tool make it helpful for dependability and performance evaluation of various systems in both academy and industry scenarios.