Xmind - Xmind is a brainstorming and mind mapping application.

UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.

Product Pains - Giving users a louder voice to help teams build better products.

FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.

Nolt - A fast & beautiful way to collect user feedback