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.
Xmind - Xmind is a brainstorming and mind mapping application.
Featureflow - Manages your SaaS features from inception to production
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Zluri - SaaS Management and Identity Governance Platform for IT Teams
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.