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A brainstorming tool that (when used with iBrainstorm Companion), allows collaboration between 4 devices via wifi.
Idea Sketch lets you easily plan your work by allowing you to develop mind maps, flow charts and concept maps.
Inspiration Software, Inc.
A mindmapping tool that allows you to save up to 5 mindmaps.
MindMeister (mind mapping)
Create mind maps using simple drag and drop functionality.
Notability allows you to sketch ideas, annotate documents, complete worksheets and make presentations.
SimpleMind+ (mind mapping)
xpt Software & Consulting B.V.
Mind mapping tool
Instantly communicate your ideas with Skitch. Use it to edit a PDF, annotate a photo, or draw something new.
Free Range Developers
TagCloud allows you to create word clouds.
Easily search, navigate and view Wikipedia entries using Wikipanion.