Massive analysis of GNSS data (Global Navigation Satellite System) requires the development of specific tools to automate the different steps of processing: from data download to ground displacements estimates. In this technical report we describe the tools and algorithms we have developed to handle the metadata associated with GNSS observations from continuous networks operating in the EuroMediterranean and African area, which are routinely processed by the three main INGV data analysis centers. Obtaining accurate metadata, which records information on how a GNSS station is equipped (receiver, antenna, monument, etc..), is mandatory in order to obtain accurate GNSS stations daily position and their evolution through time. Here we will describe the processing chain, the software...