Contentteller is a powerful content management system written in the PHP scripting language designed for sites of all sizes and types. The free Community Edition is licensed under the terms of the GPL v3.

Key features:

• Powerful but simple to use
  Manage pages and news over an easy to use interface. Whether you add images and thumbnail images or process hundreds of news submissions, the admin interface is intuitive and allows doing everything with only a few mouse clicks.
• Search engine friendly out of the box
  Get your content properly indexed in all search engines. The sitemap generator can also automatically submit your entire site to multiple search engines. Search engine friendly URLs with .html extension are supported without the need for mod_rewrite.
• Support for multiple Web sites
  Manage multiple Web sites from the same admin interface and share the user database between all sites.
• Caching for high traffic Web sites
  Multiple caches are available to keep the queries to the database server low. Additionally, it is possible to cache the entire HTML output on the file system to keep the system requirements even lower.
• Import and update everything
  Import news directly from RSS feeds, POP3 email accounts, and news servers. Update your download section fully automatically using PAD files or provide a Windows, Linux, Mac OS compatibility list to your readers using the free CompatDB.org project compatibility database.
• Powerful template and style system
  Easily change the layout to fit your Web site. You can even add PHP snippets to your templates for maximum customization. Change the appearance of your site without any HTML/CSS knowledge with the instant style editor. Add an unlimited number of templates set to your Web site and allow your readers to choose their favorite style.
• Integration with 3rd party applications
  Share the user database with the following 3rd party forum applications: vBulletin 2.2/2.3/3.0/3.5/3.6/3.7/3.8, UBB.threads 7.0/7.1/7.2/7.3/7.4/7.5, phpBB 3.0, Invision Power Board 2.x/3.0, MyBB 1.2/1.4, Simple Machines Forum (SMF) 1.1/2.0, and Woltlab Burning Board 2/3. No need to register twice. Additionally, it is possible to use forum threads for comments.
• Fully extendable
  Add and remove features with the modules system. Create your customized installation that fits exactly the needs of your Web site.
• Commercial version available
  A fully supported commercial version with long-term support is available for purchase.

Requires:

PHP 4.1.2 or better (5.2+ recommended)
MySQL 3.23 or better
40 MB diskspace

[Discovered via Major Geeks]

[40M] [Win95/98/Me/2k/XP/Vista] [FREE]