A full featured office software package. The full package - OpenOffice.org Productivity Suite - can be used for word processing, spreadsheets, presentations, graphics, databases and more. See review here.
Create you own animations with this free open source 3D animation package. Blender is a feature rich, free open source 3D content creation suite, available for all major operating systems.
A free personal publishing platform with good aesthetics, web standards, and usability. If you don't have a server to host your site try WordPress.com for a quick blogging solution.
A file archiver with a high compression ratio. 7-Zip is open source software which means it's free. Supports formats: 7z, ZIP, GZIP, BZIP2 and TAR.
Build yourself a content managed website with this open source content management platform. Drupal is equipped with a powerful blend of features and there are a wide variety of modules you can add.
A free, open source content management system (CMS) for publishing content on the World Wide Web and intranets. There are many free Joomla templates, menus, modules and other components.
Apache community of open-source software projects. These include: HTTP Server, Jakarta, Lucene, Perl, SpamAssassin, Tomcat, XML and many more.
Large Open Source software development web site. SourceForge.net provides free hosting to Open Source development projects with a resources for managing projects, issues, communications, and code.
Try before you install. Lets you test many Open Source PHP and MySQL based Content Management Systems. You have admin control and can add and delete content, change the way things look and more.
A popular free open source database. MySQL is a part of LAMP (Linux, Apache, MySQL, PHP / Perl / Python), which is a growing open source enterprise software stack.