Curious Polls - Answer a question once a day for the chance to win £100/$100
DemocracyOS - DemocracyOS is an open source application for online decision making.
minipoll - Create simple shareable polls in seconds
Loomio - Loomio helps groups of people make decisions together, online.
Polls for iMessage - Group Decisions Made Easy. Create polls, vote, and view the results directly in iMessage. The easiest way to make any group decision.
Airesis - A decision making tool for direct democracy and e-government: participate in discussions, bring your ideas, suggest solutions and vote online