CodeIgniter is a free and open source PHP framework, developed originally by EllisLab.
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Symfony is a PHP framework from French company SensioLabs.
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Zend Framework was a PHP framework developed by Zend Technologies and acquired by Rogue Wave Software. The Laminas Project is the community managed Open Source Continuation of Zend Framework managed by the Linux Foundation. Transition initiated after Rogue Wave was acquired by Perforce in 2019.