DemocracyOS - DemocracyOS is an open source application for online decision making.
Invision - Prototyping and collaboration for design teams
Owlie - A beautiful app for quick decision making with friends
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Decidim - Free Open-Source participatory democracy for cities and organizations
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.