The category generator builds category specific archive pages for each category in your blog posts.
The archive pages use the category layout (included with Octopress). In the
_config.yml you may change
the directory for the category archives if you like and the title for the category pages.
category_dir: blog/categories category_title_prefix: "Category: "
If you visit a category archive for 'open source' the url would be
/blog/categories/open-source/ and the title would be
Category: Open Source.
This plugin was originally developed by Dave Perrett but it has been updated and improved for Octopress.