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Building Websites with ExpressionEngine 2 by Leonard Murphy

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ExpressionEngine add-ons

Although not open source software, ExpressionEngine has many ways in which both EllisLab and the members of the ExpressionEngine community can add to it. ExpressionEngine 2 is built on CodeIgnitor — an open source PHP web application framework also by EllisLab. CodeIgnitor is a popular framework for PHP developers, allowing rapid development of PHP web applications. For ExpressionEngine users, this means that add-on developers have the ability to build more complex add-ons (even entire applications) for ExpressionEngine by using CodeIgnitor. It also means that there is a much larger base of developers who can build ExpressionEngine add-ons.

More developers building more and more complex add-ons for ExpressionEngine can ...

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