At present it uses asciidoctor[1] to go from asciidoc to docbook, then to .docx via pandoc[2] and .pdf via a Manning-provided tool (for styling reasons).
pandoc is pretty incredible. As you can see from its page, it can produce epubs and many other things - it's likely that with pandoc and a docbook file you can build a pipeline to take you wherever you need. For your purposes, you'd probably go from EPUB to kindle with KindleGen.
pandoc is pretty incredible. As you can see from its page, it can produce epubs and many other things - it's likely that with pandoc and a docbook file you can build a pipeline to take you wherever you need. For your purposes, you'd probably go from EPUB to kindle with KindleGen.
[1] http://asciidoctor.org/ [2] http://johnmacfarlane.net/pandoc/