This document describes a general structure for the implementation of virtual tools for remote calculation through Internet. Two virtual tools for mathematical analysis (Analys) and simulation of dynamic systems (SimWeb), supported by the Matlab c, are described. These virtual tools, permit access to the Matlab from multiple work stations, without distance, power computer restrictions or user’s knowledge in Matlab language; in a similar way, they allow the simulations of block diagrams through a friendly user interface. The remote calculation tools have low cost of implementation, allowing to obtain a system of high calculation power and accessible for a great number of users. The tools are oriented to automatic control systems analysis and simulation, but their use is expandable to other fields of engineering and basic sciences.