This is GraphvizWeb. It will be drawn in real time as you enter text.

sudo apt-get install graphviz
sudo apt-get install git
sudo apt-grt install golang
git clone https://github.com/hythof/graphviz_web.git
cd graphviz_web/src/
go run server.go

Access the browser http://localhost:8888/

Graphviz - Graph Visualization Software http://www.graphviz.org/

GPL v3 https://raw.githubusercontent.com/hythof/graphviz_web/master/LICENSE