Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Eduflow - Digital learning that actually teaches students something
Freeplane - Freeplane is a powerful and free software for building mind maps.
Flowlingo - Get fluent in a language through content immersion
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Backchannel Chat - Backchannel Chat is best in class discussion tool that is intended for teachers to streamline their class activities.