Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Loomio - Loomio helps groups of people make decisions together, online.
Framadate - Make your polls
DemocracyOS - DemocracyOS is an open source application for online decision making.
Dudle - Dudle is an online scheduling application, which is free and open source.
Airesis - A decision making tool for direct democracy and e-government: participate in discussions, bring your ideas, suggest solutions and vote online