[yubrshen]

Have you tried PlantUML? It provides means of adjusting the layout. I use it often, most of the time the adjustment is good enough for engineering communication within minutes of adjustment. It could be better if there is more cohesive documentation of its support for the adjustment. I had to search on Google many times to figure out how to add the adjustment. The adjustment consists of directives of placement and direction of links, the length of links, grouping of notes, etc. I feel that it's very promising with more popular support.

[thefunnyman]

I have not seen the layout adjustment features, but I’ve very recently been using pandoc and plantuml for all my design docs at work. I find it to be highly productive, though I still end up uploading the resultant word file to one drive for collaboration and review since that’s what everyone else uses.

[zebnyc]

Is there a javascript/clientside library which implements the plantuml visualizations? Viz.js is linked on plantuml page but it appears to be archived.