See the project's GitHub[0] and the online version[1]!

And original Delphi software homepage[2] and source[3].

[0] https://github.com/pdfernhout/plantstudio-js

[1] https://plantstudio.com/plantstudio-js-alpha1/tests-interact...

[2] https://www.kurtz-fernhout.com/PlantStudio/

[3] https://github.com/pdfernhout/plantstudio