DotNetNuke

DotNetNuke is an open-source Web Application Framework ideal for creating and deploying projects such as commercial websites, corporate intranets and extranets, online publishing portals, and custom vertical applications.
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Drupal

Drupal is software that allows an individual or a community of users to easily publish, manage and organize a great variety of content on a website. It is used for many different types of websites like, Community web portals, Discussion sites, Corporate web sites, Intranet applications, Personal web sites or blogs, E-commerce applications, Resource directories and Social Networking sites.
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WordPress

Word press is one of the most popular blogging platforms in the world, and in my opinion, it’s the best. For the small business owner, it makes editing your website very fast and easy. You can have a new page in 2 minutes, you can change the navigation structure easily, and you can even change the look of the website with one click.
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Moodle

Moodle is used for producing internet-based courses and websites. It’s an ongoing development project designed to support a social constructionist framework of education.
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Microsoft Office Share Point

Microsoft Office Share Point Server 2007 is an integrated suite of server capabilities that can help improve organizational effectiveness by providing comprehensive content management and enterprise search, accelerating shared business processes, and facilitating information-sharing across boundaries for better business insight. Office Share Point Server 2007 supports all intranet, extranet, and Web applications across an enterprise within one integrated platform, instead of relying on separate fragmented systems.
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