Circuit simulators are complex tools that depend highly on modeling of electrical circuit components. Therefore, employing an open-source circuit simulator within individuals' learning processes of electronics can be beneficial, as in both a stronger grasp of circuit component as well as circuit theory, and deeper understanding of software development. This paper demonstrates the development of an analogous circuit simulator of passive electrical components, aiming to provide a useful and open-source tool that can be used as a study project or be expanded by being further developed for practice purposes. In order to validate the correctness of the outputs of the terminal-based simulator, the simulation results of an exemplary circuit of the terminal-based simulator were compared to the simulation results of LTSpice for the same circuit.