Xmind - Xmind is a brainstorming and mind mapping application.
Notebook.ai - A smart notebook that grows and collaborates with you
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Bookblock - Design-led custom notebooks & stationery.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
Action Method Notebooks - Notebooks for making ideas happen