Xmind - Xmind is a brainstorming and mind mapping application.
Storyboard That - Storyboard That is the world's best online storyboard creator.
FreeMind - FreeMind is a premier free mind-mapping software written in Java.
Microsoft Cortana - Microsoft Cortana – Digital Assistant app brings a smart assistant to your smartphone to help keep track of the important stuff, introduced by Microsoft.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Storyboarder - Storyboarder makes it easy to visualize a story as fast you can draw stick figures.