GitHub: 60
Stack Overflow: 47
Description: Fat-Free is a single-file PHP 5.3+ Web development framework with a fast template engine, HTML forms processor and an easy-to-use SQL handler for databases.
Language: PHP
Framework Link: http://fatfreeframework.com/
GitHub Link: https://github.com/bcosca/fatfree
Stack Overflow Questions: http://stackoverflow.com/questions/tagged/fat-free-framework