productboard - Beautiful and powerful product management.
Owlie - A beautiful app for quick decision making with friends
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.
DemocracyOS - DemocracyOS is an open source application for online decision making.
ProductPlan - Cloud-based product roadmap software solution
Decidim - Free Open-Source participatory democracy for cities and organizations