A simple module for exporting content from Drupal 7, into a format (Markdown only) suitable for Jekyll.
It should work out-of-the-box (provided you also install my Markdownify module, though the code's quite simple & reasonably well documented, should you need to alter it for your needs.
Once you've installed the module, browse to:
admin/config/system/jekyll-export
..select the content types to export, enter the name of the layout you want the YAML to specify, and hit "Run Export".
The result: a zip file, containing all the specified nodes in Markdown format. You should then be able to copy the contents into the _posts folder of your Jekyll site.
Lukas White hello@lukaswhite.com