C2::Newsletter is a simple tool for sending newsletters to your visitors. It allows you to create multiple newsletters, so your visitors can select which topics they want to receive. There is an admin interface to add/edit newsletters and recipients, and send in plain text or MIME-encoded. It is easy to use, but currently only in German (English will be available soon).
Php-ZeroNet is a content management system which features addons which can be disabled and enabled at the administrator's discretion. They include Clubs, User Registration, Online Statistics, Polls, News, an Administrative Tracker, etc. Php-ZeroNet uses multiple database classes to interface with many databases, including MySQL, mSQL, msSQL, Interbase, FrontBase, Sybase, PostgreSQL, and Oracle.
Cheyenne Weblog implements some of the standards-based technology that is missing from most blogging tools. It features XHTML 1.0-compliant output, so you can apply XSLTs or feed the output to an XML publishing framework like Cocoon. It uses LDAP for authentication. It generates an RSS feed which includes the dc date element. It includes XSLTs for rendering the RDF in portals like Cocoon and Tibco.
Article Manager is a simple content management PHP program designed to speed up the activity of adding news, articles, or press releases into a Web site. A number of latest article summaries can be included in your main page or press release page with links to whole article pages. Installation is very easy.