Codeigniter CMS:

These are some of the CMS based on Codeigniter. I'll add Codeigniter libraries, plugins etc later.

Codefight CMS: codefight.org - explore - Codefight CMS on Github
Fuel CMS : getfuelcms.com - explore
Ionize CMS: ionizecms.com - explore

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Unabled to fetch codeigniter data from twitter.

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Disclaimer: This website is not run by codeigniter. Codeigniter is part of elislab which is not affilated to this website. Codeigniter CMS is an independent website to list all the php cms that are based on codeigniter. Elislab has their own cms called ExpressionEngine. Cms listed on this website are open source php cms only.