ASCII Art Diagrams

I’ve used https://textik.com and I like it.

http://asciiflow.com/ has some different features, and although it seems like it has some capabilities that textik doesn’t have (like adjusting some of the objects), I like textik.com better.

Once I’ve got my basic diagram done in textik, I use vim to further adjust it and move things around. I paste the diagrams into Confluence or other documentation.