From Brett Terpstra:

BlogBook

This is a new app I’m publishing as a complement to Marked 3. It generates a “Book” from WordPress, Micro.blog, or Ghost blogs. You can filter posts by author, categories, tags, date ranges, and more, then export a Markdown document (or collection of documents with an index file) which you can open in any Markdown editor. If you open it in Marked 3, special syntax like Table of Contents and page breaks will be rendered, and you can output to PDF, HTML, EPUB, and more.