A network of items
A visualisation of Martin Fowler's refactorings. For OO programmers, but also a general introduction to the capabilities of this software.
Brainstorm, concept-map, then sort, filter and share your ideas and plans
Add aspects, views, colours and filters to your data to gain insights
Understand novels, movies or plays
Diagrams of Romeo and Juliet showing various types of relationship.
Hierarchical information
For Java programmers: Java's collection classes and interfaces, showing inheritance, version updates, and more. Again, showcasing this app.