Abstract : The title of our thesis is Complex Systems, CAD tools and Nanotechnologies. It concerns the study of the techniques allowing to configure a circuit containing a very high number of very simple elements and inter-connected in a very complex network, in order to emulate natural or artificial complex systems. In this context we propose a platform of CAD tools which helps the implementation and the simulation of this type of systems. Initially, we implemented a first tool of this platform allowing to experiment by simulation the laws which govern the evolution of the target system. This simulation allows to validate or alter these laws before the implementation in the nanonetwork. Then, we use this tool to experiment on various complex systems, such as artificial ecosystems and systems of particles in which a relativistic space time geometry emerges, as a consequence of the type of laws of interactions of the particles.