Most Popular CMS other than Wordpress.

Content management system provides a way to custom web site  owner to control content of the website. Webmaster has full control to add/edit and delete any content uploaded by website visitor and registered users. There are many open source CMS system are available in PHP which are very user friendly and easy to use. Some of the mode popular CMS systems are.

Typo3: TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendibility while featuring an accomplished set of ready-made interfaces, functions and modules.

Movable Type: The Movable Type Open Source Project is a community effort devoted to building and maintaining the open source version of Movable Type, the award winning, ground breaking and revolutionary blogging platform. This open source platform is free for anyone to modify, redistribute and use for any purpose that they choose.

Modx: MODx is a free, fast and flexible, AJAX and  search engine optimization  Content management system. MODx helps you take control of your online content. An Open Source PHP application framework, it frees you to build sites exactly how you want and make them 100% yours. Zero restrictions and fast to build. Super-simple templates in regular HTML/CSS/JS (any lib you want).

Magnolia: It is a leading Content Management System favored for its ease-of-use and availability under an Open Source license. The page editing interface enables authors to lay out content exactly as it would appear to the website visitor. Under the hood, Magnolia contains best-of-breed Java technology based on open standards to allow for tailor-made solutions.

Liferay: With the world's leading portal and social collaboration software, Liferay gives you exactly what you need to get your work done better and faster. Liferay Portal lets you make it look and work as you want and need it to with just a few clicks. Open standards and the latest technologies ease the pain of integration.

Expression Engine: ExpressionEngine is a flexible, feature-rich content management system that empowers thousands of individuals, organizations, and companies around the world to easily manage their website. ExpressionEngine's publishing features are broad, comprehensive, and highly flexible. Their template engine permits you to build dynamic, content driven websites using simple, yet powerful, tags.