[based2]

I use PlantUML(graphviz) for this.

http://plantuml.com/sequence-diagram

https://plugins.jetbrains.com/plugin/7017-plantuml-integrati...

http://plantuml.com/eclipse

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

https://github.com/scrooloose/vim-slumlord

http://zbz5.net/sequence-diagrams-vim-and-plantuml

http://plantuml.com/emacs