There are lots of good tools for working with markdown. The cd2md
library makes it easy to convert a citedown document relying on a single repository to generic markdown. But many tools for working with collections of markdown source files either require or make it much easier for you if your source material is in a single, flat directory.
citedownmgr
lets you organize citedown source in a normal directory hierarchy, and supports:
leanpub
and bfdocs
For first release candidate:
Books.txt
file for use with leanpub