Hundreds of companies offering CMS products.
A slightly different look at the DMOZ directory.
Information on dozens of mostly open-source, mostly free CMS
Aegir CMS, APC ActionApps, AppWrap, Back-End, Bitflux, Bricolage, C-Arbre, CallistoCMS, CAMPSITE, CMS Community, CMS Resources, Cofax, DCP-Portal, Drupal, e107, Easy Publisher, Edit-X, eNetwizard, eZ publish, Geeklog, HardCore, Home, Krysalis, Managee, Metadot, Midgard, MMBase, MySource, OpenCMS, OpenEffect, PageTool, PHPNuke, PHPortal, PHProjekt, phpSlash, Plone, PostNuke, Redhat CCM, SAEBR, Slash, SSR, ttCMS, Typo3, Web500, Webgenerator-X, WebGUI, Wyona, Xoops, Zope
A group encouraging interoperability standards between open-source CMS. Two new XML WYSIWYG editors were introduced at their conference in Berkeley last month.
The best mailing list on CMS. A dozen messages a day.
CMS News reports, and publishers of the well-regarded CMS Report, which reviews the field and 22 CMS in depth. $895 (non-profit discounts available)
Philip and Alex's Guide to Web Publishing
The story of the founder of Ars Digita and his vision for content management plus. $45 on the web
Bob Boiko's Content Management Bible
Rather abstract theory (no real systems mentioned) and hugely long, but lots of valuable checklists useful when preparing or responding to requests for proposals. $35 at Amazon
eContent Magazine
Covers mostly high-end systems
