One of the majot goals of the ScienceSoft initiative is to offer users the possibility of expressing in an open and transparent way their opinion on the software they use. The Comment and Rating system is the core of this functionality. Comments on the software can be for example be expressed using the forum topics associated to each registered software products or service or directly on the official software page in the ScienceSoft portal. Ratings can be expressed using a standard rating system (for example the 5-star system). Ratings and comments have the double function of collecting user opinions and helping developers assess the user perception of their products so that it can be improved if necessary. Ratings and comments can also help other users to understand whether the software is right for them and what other existing users' experience is.