Nanoblogger is a weblog system that is written in GNU bash. It utilises common unix tools like cat, grep, and sed to create static HTML content. Because of this, nanoblogger itself is highly configurable and scriptable.
It also spots the most common feature of popular weblog engine like permalinks, archiving, atom/rss syndication, category, calendar, multi-language support and multi weblog supports.
It simple requirements of bash and some simple unix tools makes it portable across various platform (architecture and operating system). IMHO, considering how small the engine is, Nanoblogger packs the most powerful and useful features that a weblog ever need. A definite use for geeks who spends most of their time in command line driven box.
Source: Nanoblogger website