This blog runs on the Open Source Flat-File CMS Bludit. It's a straightforward and low-maintenance CMS with an active and helpful Community. Despite that, the provided Themes are limited and non satisfy my requirements. Since it is easy to make a compatible Theme and Bludit supports nearly every Web Framework, I made my own.
The result is a minimal and responsive Blog that uses Bootstrap with a grid layout and features search functionality. Feel free to use or modify the theme to your liking.