Which is the best free CMS (Content Menagement System) to build a

[Yo]

website? It should be free, simple to add content and edit the template.

[skrant0s]

i've used tons, off the shelf i liked Mambo the best, complicated but also simple if you want it.  Nice integration with other apps.  But when i comes down to it, its nicer and better to build your own.

[tadthorley]

It depends a lot on your platform, what features you need, etc.  Take a look at the CMS Matrix and choose the options you need and do some research on the results.

cmsmatrix.org

[Mesum]

These days there are 100's if not 1000's of CMS out that do exactly what you want to do. You should pick a CMS that could grow with your website and you are able to add options to it with time.
Here are few that I have used and am very happy with them:
Mambo Open Source: Very easy to use and is very expanable. The current core team is a bit slow to fix security holes.
Joomla!: This is a fork of Mambo. Very active core team, comes with 100's of add-ons and thems and support is outstanding.
Website Baker: If you want a website where you won't be needing people to register for your website then this is the CMS you should look into. Exelect for small business and building a portfolio website.

There is also an outstanding website if you want to try out more than 100 CMS': http://www.opensourcecms.com

[xfernal]

For Windows and SQL Server based systems, I recommend DotNetNuke. Yesterday, DNN released version 4.0.1 that utilizes .Net 2.0 Framework.