productboard - Beautiful and powerful product management.
Xmind - Xmind is a brainstorming and mind mapping application.
StoriesOnBoard - StoriesOnBoard helps agile teams build better products faster. The built-in guide helps you collect and prioritize ideas, understand user requirements, gather customer feedback, and validate feature ideas with internal & external stakeholders.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Roadmap Space - Customer feedback & product management software for SaaS teams.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.