fictionup is a Markdown to FB2 converter that works from the command line. It supports a limited set of tags that describe the meta-information needed to create valid FB2 documents.
Changes in the new version:
- added support for the "Series:" meta tag, which allows you to specify which series the book belongs to;
- added the ability to use Markdown markup in the annotation, and not just in the text of the document itself;
- added the ability to pack the resulting document in the fb2.zip format (command line switch -z).
License - GPL 3+.
Examples original (Markdown) and converted (FB2) documents.
Source: linux.org.ru