Cryogenic and tritium permeations are strong challenges in fusion technology. Empresarios Agrupados Internacional (EAI) has been working, in close collaboration with CIEMAT, in different EFDA tasks concerning tritium transport modelling. They especially developed a set of libraries for the simulation of systems and processes involving hydrogen isotopes for the study of transport phenomena and of physico-chemical processes related to the extraction and purification of tritium. Easy to reuse in many different systems without having to be reprogrammed, this tool could find promising application in every area which requires the simulation of processes involving hydrogen isotopes.