Perhaps not with those exact names, but there’s a fix:

https://buriedwithoutceremony.com/simple-world

There’s also !scifi@ttrpg.network which should have some overlap with cyberpunk.

I settled on Campaign Cartographer 3+.

It has a steep learning curve, but seems to be the most powerful tool by far.

The easiest Traveller version is definitely the one from Mongoose.

Also, you should check out Seth Skorkowsky’s overview videos:

https://youtube.com/playlist?list=PL25p5gPY6qKVUg6ys5N1oRlsBI7DTByyI

It’s already made in JS (but without a canvas).

So, OP: I guess it’s already Free and it’s already Open Source. Just save the HTML page somewhere.