Holo Alfa is a minimalist, mobile first Jekyll theme with focus on readability and content. Created for free and fun by Stijn. Also works great as a base to build your own theme on.
Pixyll is a simple, beautiful theme for Jekyll that emphasizes content rather than aesthetic fluff. It's mobile first, fluidly responsive, and delightfully lightweight.
The Strange Case of Dr. Jekyll and Mr. Hyde tells the story of a lawyer investigating the connection of two persons, Dr. Henry Jekyll and Mr. Edward Hyde.