Responding to the needs of a user, the selection of software components for building computer applications is a crucial step. In the matter, optimization tools exist to experiment the developed models. However, these tools are not suitable for the user and especially for a non-expert. In this article, we propose to build a software environment validating our optimization model. It is therefore an automatic aid simulator for the choice of software components of websites for the construction of modular systems. By using the method of analysis in particular the unified process of UML, at the end of our conceptual modeling, the diagrams of classes, sequences and activities are obtained. Moreover, a simulator architecture, an operation algorithm and an optimization algorithm capable of improving the choice in the selection of software components among the existing software libraries are built. Our simulator system environment is nearing completion.