Thanks Lemonnado mate, looks like you’ve started something here
I also use a Mac when in my home but use both in my studio.
I haven’t tried a Mac version yet but there is a program here to download that runs on almost all systems including a Mac.
http://www.pims.math.ca/knotplot/download/
Not sure what it’s like but it may be a good starting point.
I’m still downloading it as I type so will let you guys know how it goes.