I'm surprised there hasn't been much mention of LeanPub here; in addition to GitBook, it has what I would consider a decent modern publishing toolchain that get

I'm surprised there hasn't been much mention of LeanPub here; in addition to GitBook, it has what I would consider a decent modern publishing toolchain that gets out of the way for most types of writing. I've been writing/publishing Ansible for DevOps over the past year now, and LeanPub is the ideal platform for me to both write/author the book (though I just edit Markdown in Sublime and sync through Dropbox—you can use GitHub if you'd like as well) and to publish and sell the book. I've used GitBook a little bit, but not enough to give a really good comparison to LeanPub. But both are so much better than the old 'build your own bespoke system' or Microsoft Word-based workflow!