Can't Unsee - A simple game to test your Design skills 🖌
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
The Bezier Game - Beautiful game to master the Pen Tool
Freeplane - Freeplane is a powerful and free software for building mind maps.
Prezi Design Tool - An easy to use CANVA alternative for everyone
Pencil Project - Single-user mockup / wireframing / diagramming tool