[gpantazes]

I use PlantUML[1] for my UML diagrams.

  - It uses a human readable text-based file format renderable via the PlantUML jar. Friendly to CLI and git.
  - The diagrams are stylable, should you wish to style them. 
  - There's a PlantUML Integration IntelliJ plugin that's easy to use for preview/rendering[2]
  - Overall simple to use, but I imagine it can as robust as you want it to be. For example, the IntelliJ plugin Sketch.it automatically generates PlantUML diagrams from Java source code[3], and the source code for how it works is available on BitBucket if you want to know how it works[4]

I've seen other people suggest Mermaid.JS[5] before, but I haven't used it so I can't say how it is.

  [1]: http://plantuml.com
  [2]: https://plugins.jetbrains.com/plugin/7017-plantuml-integration/
  [3]: https://plugins.jetbrains.com/plugin/10387-sketch-it-
  [4]: https://bitbucket.org/pmesmeur/sketch.it/src/develop/
  [5]: https://mermaidjs.github.io

[pc86]

If you're going to monospace lists (why?) please format them to remove the horizontal scroll bar.

Edited to remove example that still produces scroll bar on non-maximized windows (and mobile).

[0-_-0]

Haha I'm on mobile, so you'd need to do 4 words per line

[jeannekamikaze]

The PlantUML Website used to look like you were about to download a whole bunch of malware into your computer, but the software is really great. Diagrams are simple text files that are then rendered by the tool. This frees you from having to drag and drop circles and arrows into an editor, and allows you to easily version-control your diagrams.

[kodablah]

> There's a PlantUML Integration IntelliJ plugin that's easy to use for preview/rendering

The VSCode one[0] is good too

0 - https://marketplace.visualstudio.com/items?itemName=jebbs.pl...

[ezzzzz]

Second PlantUML and Mermaid. Both work great in boostnote, which I also recommend.

[kiranp01]

plantuml is nice one. Works smoothly with VSCode extension. And wow, mermaid has gantt chart !