Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
Whimsical Mind Maps - Fast & beautiful mind maps with real-time collaboration
Zen Flowchart - The simplest tool to create flowcharts
Mind Map by RealtimeBoard - More than your average mind map
VisualSitemaps - Autogenerate visual sitemaps in seconds.
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.