This very simple tool generates Mind Maps based from text files. An outline structure creates hierarchies based on tab indents.
The Extend Toolkit
Tool: Visual Organizers
Tools for making mind-mapping and entity relationship diagrams.
Create, collaborate, and share mind maps with this flexible web-based tool– it’s “frictionless interface helps you focus”
Google Drawings is a free, web-based diagramming software that allows users to collaborate and work together in real time to create flowcharts, organisational charts, website wireframes, mind maps, concept maps, and other types of diagrams.
Use padlet to create a collaborative online virtual board for sharing and connecting ideas and media.