Jutoh book/ebook formatter?

Working on my first book. As I get closer to finishing, I will need to decide on a book formatting tool. I don’t have a Mac so Vellum is not an option. And I know that the different book sellers and distributers are coming out with tools, but I’m not sure I want to get locked in. I came across a tool called Jutoh that runs on Windows, Mac, and Linux.

Anyone have any experience or looked into Jutoh or other non-Mac formatters?