Zen Flowchart - The simplest tool to create flowcharts
Whimsical Mind Maps - Fast & beautiful mind maps with real-time collaboration
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.
Mind Map by RealtimeBoard - More than your average mind map
Scheme Flowcharts - A huge pack of layouts for UX prototyping
Platforma Flowcharts - Collection of cards for website and app prototyping