Consul is a new citizen participation platform being developed by more than 60 governments around the world, and shared for free. It is the broadest existing project of citizen participation allowing institutions worldwide to take part in all the participation processes.
You can find all the information about Consul on the project website: http://consulproject.org
Recently the first ConsulCon meeting was held in Madrid, where over 200 people from more than 15 countries shared their ideas, experiences and knowledge about their use of the platform.
Information about the event can be found here: http://democratic-cities.cc/consulcon/