Pintask - Pintask is the most customizable Kanban board.
Loomio - Loomio helps groups of people make decisions together, online.
TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.
DemocracyOS - DemocracyOS is an open source application for online decision making.
winio - The fastest way to sync your team with ongoing projects
Airesis - A decision making tool for direct democracy and e-government: participate in discussions, bring your ideas, suggest solutions and vote online