The RODIN platform is an Open Source extensible Eclipse-based IDE for Event-B that provides effective support for refinement and mathematical proof. RODIN emerged out of the RODIN FP6 Project (2004-2007). It is still actively supported by the European Commission through the Deploy FP7 project (2008-2012) and the FP7 ADVANCED project (2011-2014). Over the years RODIN has known a growing success from a usage point of view, as show by its download statistics on figure 1. However in order to assess the long term sustainability of RODIN, it is important to pay a closer look at key Open Source characteristics of the project and of the community that formed around it.