I use balsamiq all the time - helps me make diagrams with a sketchy feeling. It is designed to be used for the mockups only but I find myself using it for everything. You might have seen it used in (pretty famous?!) developer roadmap https://github.com/kamranahmedse/developer-roadmap or in some of my blog posts https://medium.com/tech-tajawal/rabbitmq-at-tajawal-c4eeccdd...