Make sure to click around in the history - 2019 was absolutely dominated by map border generation posts so far (concept; grammar; different styles: e.g. celtic knot generation). While it was interesting, there's much more. Some examples:

barrier islands (islands parallel to a coast, a very common thing as it seems): https://heredragonsabound.blogspot.com/2018/12/barrier-islan...

grassland: a short series, starting at https://heredragonsabound.blogspot.com/2018/08/the-grassland...

names: naming places is a larger series of postings, he's starting it here: https://heredragonsabound.blogspot.com/2018/06/the-naming-of...

...

Just reading the grasslands series which is very tenuously linked to something I’m working on - those posts are fascinating. Thanks for the heads-up.

Is his software available anywhere?

No, it's not. However, you can see the software that his work was originally based on here:

https://github.com/mewo2/terrain

No, it is not, as far as I know.

I have been following this for what seems like a couple of years now. As someone who is into both maps and procedural generation of content, it's fascinating.

Procedural generation as a whole has so many, so very many algorithms out there and it is pleasant to see quite a few of them being born right on that blog.

This blog has such a wealth of interesting information!

I wish more people would blog regularly about their process of creation.

I really want to implement that Planchon Darboux algorithm now...