[brudgers]

Given the use case, PlantUML. Can be used in many editors and IDE's. It is much better than the website might suggest.

http://plantuml.com/running

[edit] AutoCAD can be run interactively from the command line. More like say Bash than Vim...and since it is extensible with Lisp, more like Emacs than Vim as well. There once was a Cad program, Generic Cad, that used two letter combinations for commands somewhat like Vim. AutoDesk bought it and killed it in the early 1990's. At the time, it was the second most popular PC Cad package behind AutoCad.

[melle]

Thanks for the pointer, I'm looking for something a bit more interactive though. I might run a few tests to see how quick it responds.

Ideally in the program I'm looking for I can perform editing operations on the image/drawing/diagram with a few key-strokes.