Content management systems
- PROPS open publishing system for online newspapers and magazines
- Content Management System By Contensis
- Active2 - Used by Indymedia
- Apache Lenya
- liveSTORYBOARD CMS
- Scoop - Used by infoAnarchy
- Slashcode - Used by Slashdot
- WikiWiki Software
- Web Collaboration Software and Collaborative Content Management System - An information resource for web collaboration and other related collaborative content management software with focus on YEdit.
- CMF - Zope's Content Management Framework and Plone the most popular portal package for CMF.
- Citydesk windows, free version limited to 50 pages.
Remember, anything which can wholly be used to author could technically be considered a CMS: