showthatyouhelp is a social network about green topics, like sustainability and ecology. If you’re learning CodeIgniter it might be an interesting code and you’ll be able to reuse some things. Also, if you’re a developer interested in green topics you can help improving this website.
From a developer perspective, there’s PHP and CodeIgniter code. How to fetch an URL’s information and retrieve its images. It also uses CodeIgniter’s language files for translation. Furthermore, it’s a very simple application.