When creating your diagrams you'll have a multitude of possibilities: quick links between concepts, the creation of new nodules, inserting images and icons, different views (cloud-shaped, classic diagram, etc.) and dozens of formatting options.
Within each of the ideas or tasks you create on the diagram, you'll be able to write a more extensive document on which, thanks to an integrated word processor, you'll be able to write down anything related to that point. This way, you’ll be able to create an apparently small diagram that’s actually loaded with content.
Freeplane is a tool that opens up many possibilities for creating diagrams, although its not-so-pretty interface makes it a little difficult at first.