I used to use Visio at my previous job for making flowcharts. Whenever it wasn't needed for displaying company processes, I still found other uses for it. It's so easy to get your head organised

When I switched jobs, I missed it so much, I started to look for a proper (and free) alternative. I ended up using https://www.draw.io/
It's not just as easy as Visio, but it's the best one I could find :-)