Some stuff I'd like to share with the rest:
- PlantUML's default style has improved since the days of red/brown borders, pale yellow boxes, drop shadows and such but I've attempted fixing it before through a preset style [I've made before here](https://gist.github.com/jerieljan/4c82515ff5f2b2e4dd5122d354...). It's obsolete nowadays, since I'm sure someone has made a style generator somewhere, and last I checked, PlantUML allows a monochrome style out of the box.
- [Eraser](https://app.eraser.io) is promising, considering that it's trying to blend both diagram-as-code markup along with the usual visual diagram editor. I'm still seeing if it's worth picking up since Miro's hard to beat.
- On an unrelated note, [WikiJS](https://js.wiki/) is a self-hosted wiki that happens to support draw.io, PlantUML and MermaidJS diagrams out of the box. Quite handy to have for your own docs.
- I use Miro nowadays since it's significantly quicker to draw things freeform and to collaborate live with folks on a whiteboard at the cost of having your diagrams in markup, but it's easy to miss the integration that [you can actually import PlantUML](https://help.miro.com/hc/en-us/articles/7004940386578) and Mermaid diagrams in a Miro board too. You can also do edits too, but it's on its own PlantUML section, of course.