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This is where you can find out what "open source" software is all about.
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Joomla is my preferred content management system. It is open source and free to download with an an enormous variety of components and facilities available from third-party sources.
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This is an organization that was formed to support the work of the Joomla project. It details the level of practical and legal support that is available to the whole project.
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PHP is a popular, scripting language that is particularly suited to web development. It is used to produce the Joomla content management system - and a host of other facilities!
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MySQL is an open source database application with an enormous and well-established user-base. It is used in the Joomla content management system... and many, many others!
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A "wiki" is a software concept, but this is one of the most popular sources for a standard "wiki" installation. It is free and "open source", but is fairly complex to install and maintain.
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Moodle is a free and open source software application that is designed specifically for delivering educational material over the internet. It is used by all sorts of educational establishments and is built around delivering "courses" through various types of computer content, from basic text to video. It includes extensive systems for managing both course material and students.
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Drupal is an open source content management system that is in widespread use around the world. It is extremely versatile with extensive (though complex) security features.
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WordPress is a widely used content management system that offers a simple, fast and free way of building your own website.