Jekyll is a static blog-aware site generator. That means you can blog by simply writing Markdown files on your computer without the need for a database while still using blog features like tags, categories, archives and so on. If you are a web-developer who prefers to write his own HTML over using a CMS, than Jekyll is for you. Jekyll sites can be hosted for free on the blastingly fast GitHub Pages service. Jekyll is written in Ruby and has quite some Plugins.