https://axle.design and https://fulcra.design are both currently published via Blot.im.
I use Blot’s Git option. So, once I’m done writing and editing my markdown files, I use a Git command to publish them.
That’s it!
Articles are usually written in Obsidian, but occasionaly iA Writer.
Worth noting: unlike every other poster yet, I only ever have one file for any post, and that file is the blog post. Zero exporting and importing, zero copying and pasting. There is no transfer of data between apps or services. I just love the parsimony.