- Graphviz (of course)
- http://ditaa.sourceforge.net
- https://github.com/dbushong/shaky
- https://github.com/vidarh/diagram-tools
- https://www.websequencediagrams.com
- http://monodraw.helftone.com
- http://asciiflow.com/
- http://knsv.github.io/mermaid/
- https://github.com/blampe/goat
- https://asciidoctor.org/docs/asciidoctor-diagram/
- https://plantuml.com/
- https://draw.io/
- https://github.com/dhobsd/asciitosvg