itch.io

It looks like Stronghold because it is built to be Stronghold, but is as the intro paragraphs says ‘an open source fan remake’ with an Apache License.

That means it is made publicly, anyone can see the code and no-one can hide it. Also, no one can make money off it.

Most importantly is that it can be kept up to date and therefore still be run on current and future PCs and OSes as well as have mods and other things added to it as the community decides, not someone in their high castle trying to make more money than trying to provide the best gaming experience...