ScribeHow - Create step-by-step user guides, with a simple click

Xmind - Xmind is a brainstorming and mind mapping application.

iorad - Tired of explaining with screenshots? Instant Interactive Tutorials with iorad

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

Archbee.io - Archbee is a developer-focused product docs tool for your team. Build beautiful product documentation sites or internal wikis/knowledge bases to get your team and product knowledge in one place.

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