[fragmede]

I've used https://whimsical.com/ (no affiliation) to do mind maps, which is a GUI tool, and it supports doing arbitrary lines/arrows, but it's not super happy with doing that.

GraphViz will go from text to whatever tree-ish graphical representation you want, but naturally there is some time investment required, especially if you want pretty output.

[jmiskovic]

Just tried whimsical. It's impressive for online tool, but the UX is too slow for me. I need a fast visual tool to create graphs, GraphViz is just the rendering part. Thanks for suggestions, though.