WordPress is an online, open-source website creation tool written in PHP. Technical experience is not necessary. It is intuitive and easy to get a simple site set up quickly. It is easy to paste text from a Microsoft Word document into a WordPress site. While very friendly for non-developers, it is a flexible platform also capable of creating very complex sites.

Umbraco is a free, open-source CMS for publishing content on the www and intranets. It is primarily written in C# and built upon Microsoft’s .NET Framework, using ASP.NET. It is fully featured with the flexibility to run anything from small campaign sites to complex applications. It is strongly supported by both an active community around the world and a commercial organization.

Is a web CMS based on Microsoft .NET. It is open-source software that is intended to allow management of websites without much technical knowledge, and to be extensible through a large number of third-party apps to provide functionality.

Joomla! is a free and open-source CMS for publishing web content. Joomla! is more complex than Wordpress but less complex than Drupal. It has a relatively uncomplicated installation and setup. With a relatively small investment of effort into understanding Joomla’s structure and terminology, fairly complex sites can be created.

Drupal is a free, open source CMS. It is a powerful, developer-friendly tool for building complex sites. It requires some expertise and experience to operate. However, it also is capable of producing the most advanced sites. For a complex, highly customized site requiring scalability and complex content organization, Drupal might be the best choice.

TYPO3 is a free and open source web CMS written in PHP. TYPO3 is credited to be highly flexible. It can be extended by new functions without writing any program code. It is used to build and manage websites of different types and sizes, from small sites for individuals or non-profit organizations to multilingual enterprise solutions for large corporations.

Moodle is a free and open-source learning management system written in PHP. It is distributed under the General Public License (GNU) and used to create websites with online courses for blended learning and other e-learning projects in schools, universities etc.

phpWCMS is a free and open-source web based CMS. It is well structured, quickly installed and simple to use even for beginners. Additionally there is an active user community providing new templates and tips on a regular bases, which allows quick learning.

DokuWiki is an open-source wiki application written in PHP that does not require a database. It is a simple to use and highly versatile software especially useful in the enterprise context.

MediaWiki is an open-source wiki application written in PHP that stores the contents into a database. It is designed to run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich application that display data stored in a database, such as MySQL.

phpBB is a free, open-source Internet forum package written in PHP. It supports multiple database engines such as MySQL, Oracle Database, Microsoft SQL Server etc. With an extensive database of user-created modifications and styles database containing hundreds of style and image packages to customize boards, very unique forums can be created in minutes.

phpList is an open-source software written in PHP. It is designed for managing mailing lists and sending emails such as newsletters, press releases and marketing campaigns to a list of subscribers.

BlogEngine.Net is an open-source blogging platform. It is easy customizable, full featured and may be the simplest and most light weight ASP.NET blog at the moment.

Magento is an open-source platform written in PHP that offer retailers an e-commerce solution. Magento’s intuitive administration interface provides search engine optimization and catalogue-management tools to control the look, content and functionality of every retailer’s unique business requirements. It has more than 250,000 merchants to date around the globe.

OsCommerce is an open-source online store-management program that provides tools to set up very own complete and self-hosted online stores and websites to securely sell products and services to customers worldwide. It has over 280,000 store owners, developers, and service providers to date in the community.

Zen Cart is an open-source shopping cart software available under the GNU General Public License. Zen Cart branched from osCommerce as a separate project in 2003. Beyond some aesthetic changes, the major differences between the two systems come from Zen Cart's architectural changes, e.g. a template system, and additional included features in the core.

PrestaShop a free, open-source solution for e-commerce. It is written in PHB and published under the Open Software License. It includes themes so that customers can be welcomed the moment of set up. With the Live Configurator the PrestaShop theme is easily to customize by changing fonts and colors. PrestaShop is currently used by 250,000 shops worldwide and is available in 60 different languages.

SugarCRM a customer relationship management (CRM) system. Its functionality includes sales-force automation, marketing campaigns, customer support, collaboration, mobile CRM, social CRM and reporting. SugarCRM reported over a million users in 2013.

Coppermine is a free, open-source photo gallery software application. It is written in PHP using GD or ImageMagick as image library with a MySQL backend and licensed under the GNU General Public License. CPG is fully featured and multi-lingual.

BBClone is a free, open-source web counter software written in PHP and released under GPL license. It gives a detailed view of the visitors of website and the data they provided, like their IP, browser and so on. As it is not just showing a number of visitors, this is very handy for webmasters that want to see who is visiting their sites, what browser people use, where they came from etc.