Copy the application/ directory into an existing CodeIgniter project.
- Redis http://github.com/antirez/redis
- Predis http://github.com/nrk/predis
- PHP Markdown Extra* http://michelf.com/projects/php-markdown/
- PHP SmartyPants Typographer* http://michelf.com/projects/php-smartypants/
*Not really needed. You could just go through the code and remove those parts, but your blog will be a tiny bit uglier.