Mind Map by RealtimeBoard - More than your average mind map
Whimsical Mind Maps - Fast & beautiful mind maps with real-time collaboration
Text 2 Mind Map - Make a dynamic mind map from a plaintext nested list
Zen Flowchart - The simplest tool to create flowcharts
Whimsical - The visual workspace for teams.
Whimsical Docs - Docs, flowcharts, wireframes, and mind maps in one place