Publish by John Sundell
I don't actually think I mentioned using Pelican, which I switched to after Ruby. I hate Ruby. I didn't hate Python, but given the chance to use Swift instead why wouldn't I switch? Having the ability to use only Xcode and git is fantastic.
Publish is available on Github. John Sundell uses it to build Swift by Sundell, which looks as good as I am ever going to need.
It's very easy to set up, at least as easy as Jekyll or Pelican. It's totally easy to convert old blogs. I chose to rearrange images somewhat so converting absolutely everything, including fixing up some images and typos, took just a few hours. If you have an interest take a look, I think you will like it.
Obviously this is pretty vanilla right now because I have read nothing but the github page, but I think it's got a lot of potential.