TCL/TK grafcet Editor
Grafcet is a french name if a type of 'Finite State Machine'
I do not have the authorship of that (very) old and abandoned project.
The original page for it is there: https://perso.ensta-paris.fr/~diam/gred/ with broken links, so I wanted to push in on github, just for it not disappears forever.
It has helped me a lot in the past, to accomplish a complex project (that has been cancelled, too) where the criterias for selecting such a tool were:
- open source and free
- light
- graphical
- description file in text format
- portable to multiple platforms
I would like to thank again the original authors for their great work. AFAIK there is today no such modern equivalent that matches all the above criterias.