If you like drawing diagrams and flowcharts to help visualise structured hierarchical information, then yEd is a program that you should try. It's a diagramming tool that is both flexible and powerful. Use it to create network diagrams, table plans, work or study plans, project outlines, and just about anything else.
It's a 63 MB download from https://www.yworks.com/products/yed/download and is completely free. The program is also malware-free according to VirusTotal and Web of Trust.
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