We use Atlas to build the e-book versions of Pro Git (which you can download at https://progit.org/ https://progit.org/). We don't use their editing system, tho

We use Atlas to build the e-book versions of Pro Git (which you can download at https://progit.org/ https://progit.org/). We don't use their editing system, though; it's basically a continuous-deployment system for the book, and it does a pretty great job at that.