DemocracyOS - DemocracyOS is an open source application for online decision making.
Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.
Loomio - Loomio helps groups of people make decisions together, online.
Socratrees - Socratrees outlines arguments into intuitive hierarchies of supporting and opposing statements. This design is loosely based on argumentation theory. However, we do not expect you to be familiar with theory in order to start using Socratrees.
Airesis - A decision making tool for direct democracy and e-government: participate in discussions, bring your ideas, suggest solutions and vote online
Acceptify - With acceptify, fast and sustainable decisions can be made for a variety of people.