|I have tried 22 different CMS's in the past 6 years. I have narrowed down the absolute best of the best to these 4.|
Enterprise level - Dont attempt to play with these unless you are an experienced webmaster/coder. You can build some of the most powerful sites on the internet with them, but you need to know what you are doing.
The 2 most powerful open source cms's out there are: Krang and Bricolage.
Bricolage powers sites like Entertainment Tonight, The World Health Organization, The Ad Council, MacWorld, MacCentral, and PlaylistMag.
Another beautiful site made with it: http://www.grist.org/
Bricolage can be found here: http://www.bricolage.cc/
Krang is simply amazing as well. Powering sites like New York Magazine (New York Metro), Motortrend, and Import Tuner Magazine. Krand is also used to power all 220 websites in the PriMedia Corporation portfolio of news and magazine websites.
Krang can be found here: http://krang.sourceforge.net/
Commercial and Portal Sites:
For commercial sites I only use CivicSpace. Its the same cms Mozilla.org and SpreadFireFox.com use to power their sites. For ease of use and stunning array of tools, its absolutely perfect. Also it is an absolute dream for SEO minded builders.
CivicSpace can be found here: http://civicspacelabs.org/home/
For portals I recommend nothing besides CPG-Nuke's newest creation called DragonFly. DragonFly easily blows away Mambo, Xoops, Typo3, PHP-Nuke, Siteframe, Drupal, Geeklog, PostNuke, ezPublish and Movable Type combined.
DragonFly's main benefits:
- disgunstingly fast and simple to use, create, and setup
- uses less then half the bandwidth then most of the CMS's I listed above.
- Took 2 of the best open source projects online (PHPBB and Coppermine Gallery) and fully integrated them into the core of the basic DragonFly install.
- the most SEO friendly CMS I have ever used. Puts Mambo and all the others to shame as far as SEO goes.
CPG-NUKE DragonFly is found here: http://www.cpgnuke.com/
Obviously though, these are just my opinions.