From the website:
What is echo?
echo is the instrument for a new kind of participatory democracy […]. Unlike usual Web 2.0 applications, echo provides a clearly structured opinion base and allows for a solution-oriented social collaboration. It unites technical innovation and human scientific knowledge into a unique concept. This helps people to better understand backgrounds and interrelations of topics, jointly make sound decisions and turn them into reality. Accordingly, echo comes with three main functional areas: Discuss – Connect – Act!
Through the combination of these three functional areas, echo establishes a unique virtual space for a fully democratic collaboration, which is able to lead to visible results in everyday life of the people with minimal effort.
Additionally, by spreading its functionality beyond the limits of individual websites, echo lets all forces be bundled for a sustainable change throughout the whole internet.
echo is open-source and its source code is available on Github.
echologic is developed by Berlin, Germany-based echo source e.V.
Update: echo has been discontinued. In order to access the site, view an archived copy.