Extremly simple "static" PHP blog that renders markdown posts. No installation or database needed. To create a post just write a new .md file. Everything else just works.

Note: It's not a full blogging platform, does not currently come with any premade themes, it's just a script and specific folder structure to load and display markdown files. The demo site looks pretty good as-is, though.

Requires PHP v5.x or later and a web server that supports .htaccess (Apache and Lightspeed, though I don't see why you couldn't write some rules for Nginx).