CodeIgniter is described as 'Powerful PHP framework with a very small footprint, built for developers who need a simple and elegant toolkit to create full-featured web applications' and is a popular software framework in the development category. There are more than 25 alternatives to CodeIgniter for a variety of platforms, including Windows, Linux, Mac, Web-based and Self-Hosted apps. The best CodeIgniter alternative is Django, which is both free and Open Source. Other great apps like CodeIgniter are Laravel, Ruby on Rails, Symfony and Zend Framework.
Phalcon is a high-performance PHP web framework based on the model–view–controller (MVC) pattern. Originally released in 2012, it is an open-source framework licensed under the terms of the BSD License (from wikipedia).
FAT-FREE is a powerful yet lightweight PHP 5.3+ Web development framework designed to help you build dynamic and robust applications - fast!
Pyramid is an open source web framework written in Python and is based on WSGI. It is a minimalistic web framework inspired by Zope, Pylons and Django.
Laravel Boilerplate provides a very flexible and extensible way of building your custom Laravel applications. It provides Administration Dashboard with Gentelella Admin Theme, Responsive Layout, Bootstrap 3, Font Awesome, and a lot more.
ApPHP MVC Framework is a web application framework that is designed to provide modern and rapid development of websites and web applications.
Fuel is a simple, flexible, community driven PHP 5.3 web framework based on the best ideas of other frameworks with a fresh start and a design pattern in HMVC.
Phraw, a PHP micro-framework. Phraw is indicated for small web sites and small applications because is fast to learn, fast to bootstrap and fast to serve requests.
Grails is a high-productivity web framework based on the Groovy language that embraces the coding by convention paradigm, but is designed specifically for the Java platform.
PHPixie is a modern component-based PHP 7 framework. It is thoroughly tested with high code coverage and provides blazing performance without sacrificing any features. All PHPixie components can also be used standalone and provide a great foundation.
Spiral Scout’s flagship open-source product, Spiral Framework, is a PSR compliant PHP7 framework that allows developers to craft faster, cleaner, more efficient applications.
It is a new batteries-included web framework optimized for longterm productivity and programmer happiness.
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Because of its easy access and it being free.