ETNA is a project of a federated social network (based on already developed open source software i.e. buddycloud) for implementing participatory auditing on open spending data actually released by public entities and some private companies. The aim is simplify and enrich cost and budget open data and make them understandable by all, by directly involving transparency offices and public project managers. ETNA scope is to create real value for citizens from Spending Open Data (budget...