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Web Services
A look at some popular web-based applications.
Content Management Systems
Dokuwiki — easy to install and configure, a terrific way to organise internal documentation for your company and a rather decent way to launch a good looking web site that is fairly easy to maintain.
Pimcore — a more sophisticated content management platform that is harder to install, but offers commensurate flexibility and features.
E-commerce
Open source e-commerce software.
Magento — an open-source e-commerce platform written in PHP, initially released in 2008.