I'm searching a cms that likes to work with subdomains. Like f.e cars.maindomain.com and seo.maindomain.com , but i'dd like to have one database and one adminpage. Already heard about worldpress MU, but i'm searchinf for something more than for blogs. Greetz
http://www.pmachine.com/ee/ a modular, flexible, feature-packed web publishing system that gives you the firepower to create a site with zero compromises. this is my thread in there with some releavant queries, i wanted, add to same or new question you would need to ask: http://www.pmachine.com/forums/viewthread/26456/
Expression Engine is the way to go if you can spare the $$. But with a little creative thinking you can do a lot with WordPress and use it as a simple CMS. What functionality do you need exactly?
Drupal does exactly what you want. It's entirely free (GPL-licensed), widely used, has a large and supportive community, and a wide wariety of third-party add-on modules. Multisite functionality is built-in. I'm using Drupal almost exclusively these days, as it can handle pretty much any kind of site I throw at it. Most recently, I created a Blogger-style blog network where users all have their own domains (as in username.blogspot.com) but there's just one database and Drupal installation behind it all. For an example of a small content site done with Drupal, check out my signature. Drupal is a seriously powerful and versatile tool
PM me if you have any questions or run into problems... Drupal.org's support forum is also a very friendly place
Mambo is one of the most sophisticated Open Source CMS ever. It recently changed it's name to Joomla! due to some copyright problems with the original maker. Now it is controlled by Opensourcematters.org. I use Mambo in all my setups and have no problems. Now with the Joomla release slated for sometime this month, it will be beyond comparison. Drupal is not so a close second in my opinion. You can visit http://joomla.org too for further information.
Medusa, no disrespect, but while Mambo/Joomla may be a decent CMS (I myself have a couple years of experience using it), it doesn't happen to be a very good answer to the original poster's question, which concerned a multisite CMS. Having recently abandoned Mambo and migrated several dozens of sites from Mambo (version 4.5.3) to Drupal, I can attest that Mambo has no built-in multisite support whatsoever, there is one add-on module on MamboForge that provides multisite support but it's a very crude hack, and the only hope for Joomla multisite support in the foreseeable future is the OpenSEF project, currently in beta (OpenSEF may be more familiar as Xaneon Extensions for Mambo; but the Xaneon team stopped all Mambo development and moved to Drupal, so OpenSEF is an open-source community project now).
OK, you are right there, I did not specifically answer the original poster's question by an oversight... I just thought that he was looking to install a CMS in in a subdomain... dumb as I was