GitHub: 79
Stack Overflow: 86
Description: CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications.
Language: PHP
Framework Link: https://codeigniter.com/
GitHub Link: https://github.com/EllisLab/CodeIgniter
Stack Overflow Questions: http://stackoverflow.com/questions/tagged/codeigniter