Technical support organizations’ (TSOs) roles are mainly to provide technical expertise to State’s nuclear safety regulator but they assist also national authorities for international safeguards implementation. Development of digital tools in this area is time saving and of major help to fulfil the various commitments in the frame of international safeguards agreements. In France, the Non-Proliferation and Nuclear Material Accountancy Department (SNPC) of IRSN (Radioprotection and Nuclear Safety Institute) is the TSO that provides support to the French authority in charge of monitoring the implementation of international treaties of non-proliferation (CTE). Its four main activities consist in advising the French Authorities (CTE) and assisting the operators, managing declarations, escorting international inspections and assessing documentation. The SNPC department has developed many tools over the past years, presented in this paper, to gain in efficiency in its activities: a tool dedicated to nuclear material declarations called GAUSS that collects and processes accounting data for the declarations linked to the safeguard agreement INFCIRC/290, to voluntary agreements INFCIRC/415, INFCIRC/549 and to bilateral agreements; a web-portal for the French Additional protocol declarations called PASTEL developed for data collection and compilation process; a software called OSEILLE for the management of information related to inspections performed in France by EURATOM and IAEA (notifications, count of efforts, statistics, observations during inspections⋯); two web-portals called PIMENT and CENTIME and one application called GENIE for the gathering of data related to transfers of nuclear material, processing of this data and transmission of the notifications to the competent authorities.