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Xmind - Xmind is a brainstorming and mind mapping application.
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Limnu - Sketch, share and collaborate with your team
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
MultiDraw - Draw with others in real time.