I've been using Whimsical[1] for drawing charts and diagrams and i'm pretty happy with it. I also use Markdown for writing documentation with Vim, very rarely

I've been using Whimsical[1] for drawing charts and diagrams and i'm pretty happy with it. I also use Markdown for writing documentation with Vim, very rarely i convert it to PDF with pandoc. [1]: https://whimsical.com https://whimsical.com