Drupal is an up and coming CMS with many features and an ever growing support community.
Joomla is one of the most popular open source Content Management Systems on the web today.
Sugar CRM is the best Open Source Customer Relationship Management software that we have found. This software has numerous capabilities right out of the box and can help you and your small business keep your clients organized.
Wordpress is by far the most popular open source blogging web application out there. It's easy to use and there are a number of addons and templates to help you get started on your own customized blog.
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