- https://t.co/1FSFQUfp
- http://t.co/vJzKAzFs
- http://t.co/ncTxB5za
- http://t.co/klb4yNn7
- https://twitter.com/randomfrequency/status/244188321834758145
- https://www.lucidchart.com/
- google drawings (a part of google docs I never noticed somewhow)
- http://t.co/E5uMkjaP
- https://t.co/8w7ob5dc
- Emacs' Artist Mode
- gliffy
- http://t.co/RZQbR8G9
- https://t.co/EQtDc4R7
- http://t.co/oW9RF8ui
- http://t.co/3jIhFI4l
- https://t.co/YRH1tvOk
- http://t.co/P933eKzj
- https://t.co/vHKNlBCM
- Balsamiq MOckups

I ended up using ASCIIflow but think in the future will use Google Drawings fwiw.