Screenshot of Freemind 0.8.0 by Daniel Polansky

Freemind is an amazing mind-mapping tool, but unfortunately it's not in active development since 2016. It's also a desktop application, which has to be installed on a particular computer. Freemind requires Java to be installed and moving your mind maps between computers is a bit complicated.

Nested Notes focus on providing similar basic features of Freemind such as: simple mindmapping, similar mechanics of creating and moving nodes and ability to control the interactions with the tree notes through keyboard. Nested Notes bring also major improvement over Freemind giving you ability to save your notes in the cloud, and edit them using web interface. No need to install Java or anything else on your computer.