This work presents the integration of different computational techniques to specify and design a new computational electromagnetic simulator, called Free Visual FDTD 2D (FV-FDTD-2D), to support the Telecommunications teaching-learning process. Some Software Engineering, human-computer interface (HCI) and an advanced numerical method, based on Finite Difference Time Domain (FDTD), were successfully integrated. It provides an efficient processing and usable software, which detailed documents for developers and comprehensive graphical output results. The FV-FDTD-2D has been adopted in some technical lectures related to telecommunications, presenting successful evaluations by the attempted public.