According to a recent study by Stanford University consulting professor Jonathon Koomey, there are approximately 31.6 million servers installed around the world, including about 11.5 million in the United States. If organizations had to use only proprietary software for all of those systems, the resulting costs would be astronomical.
Fortunately, the open source community has a huge selection of server software that can lower those costs significantly. For this list, we focused on some of the top open source tools that offer alternatives to proprietary server software. We've organized them into categories to make browsing the list easier.
As always, if you'd like to suggest additional open source server software that you think should have been included on the list, please feel free to add it in the comments section below.
The "world's most popular open source CMS," Joomla runs 2.7 percent of the websites on the Internet, including sites for Harvard University, Citibank, IHOP and the Guggenheim Museum. It provides both a repository to manage your Web content and a platform to build your own Web applications. Operating System: OS Independent
Well-known users of this very popular CMS include the White House, the Economist, Fast Company and the World Wildlife Fund. It's highly flexible, robust and can be used for "everything from personal blogs to enterprise applications." Operating System: OS Independent
This award-winning Web content management system offers ease of use and a modular design. It's driven by a MySQL database and includes advanced user management features. Operating System: OS Independent
Alfresco combines document management, Web content management, records management and collaboration into a single package. In addition to the free community version, it also comes in paid Enterprise and Cloud versions. Operating System: Windows, Linux
Used by 700,000 websites, DotNetNuke claims to be "the leading open source Web content management system for ASP.NET." It comes in a free community edition and paid professional editions; in addition, more than 10,000 modules and skins are also available for purchase. Operating System: Windows
Downloaded more than 60,000 times, this CMS is growing in popularity, particularly among SMBs. As you might guess from the name, its claim to fame is its simplicity and intuitive interface. Operating System: Linux
Liferay includes content and document management, Web publishing, shared workspaces, collaboration, social networking and identity management capabilities. It advertises itself as simpler than WebSphere and more flexible than Sharepoint. It's also available in a commercially supported enterprise edition. Operating System: OS Independent
Boasting Fortune 500 and government users in more than 100 countries, Magnolia was designed to make it easy for business users to enter and edit Web content. Commercially supported versions are available with prices that vary based on the SLA. Operating System: Windows, Linux
WebGUI calls itself an "all-in-one CMS," and it offers both Web content management and a Web application development platform. In order to help users learn the software, the site offers a video tutorial and weekly training webinars. Operating System: Windows, Linux/Unix, OS X
Owl lets you create a knowledgebase or FAQ site. It's available in both a regular version and an "ultralite" version that does not use a database. Operating System: Windows, Linux