
Plone is a free and popular open source content management system based on the Python programming language. It is built on top of the Zope application server and shares many similarities with WordPress.
Plone is positioned as an “Enterprise CMS” and it is very easy and flexible to use. Using Plone you can design, create and manage content rich websites. Plone is commonly used for intranets and as a groupware collaboration tool or a document publishing system.
SOGo is a free and modern scalable groupware server. It provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV, as well as Microsoft ActiveSync. SOGo offers shared calendars, address books, and emails through your favourite Web browser and by using a native client such as Mozilla Thunderbird and Lightning.

LimeSurvey is one of the many open source survey applications written in PHP, and uses a MySQL or PostgreSQL database. LimeSurvey is a user-friendly web application that allows users to develop, publish and collect responses to surveys. Users can use rich text in questions and messages using a rich text editor, and images and videos can easily be integrated into surveys. Surveys can be public, or can be strictly controlled through the use of ‘once-only’ tokens for each survey participant.

This step by step tutorial will show you how to install PHP-Fusion 9 on a Debian 8 VPS with Apache, PHP and MySQL installed on it. PHP-Fusion is fast and light-weight open-source content management system (CMS) written in PHP. PHP-Fusion 9 includes common features found in other content management systems. By comparing it with the PHP-Fusion 7 version, there are some new features, such as a fully integrated and comprehensive SEO engine, full core support for Multilingual content, PDO support, Bootstrap support, new themes etc. PHP-Fusion comes with a simple but comprehensive administration system.