WordPress
From Cship
Wordpress is one of the most popular CMS, it is used primarily by bloggers but it can also be used as a general CMS - it is available for free from Wordpress.org.
[edit] Anonymity
For Wordpress there is a Plugin called "Delete Comment IP" which prevents the IP storage fairly satisfyingly.
Every time, if a new comment is delivered to the Blog, the following stored data from the database are deleted for all existing comments which are older than five days: The IP address of the commenting reader, his given mail address and the identification of his browser. The data are deleted only with released comments which are not marked as Spam.
The standard version of the Wordpress-Plugin "Delete Comment IP" extinguishes IP addresses of free-switched comments only after five days. With a little modification the deletion occurs immediately:
Plugin "Delete Comment IP immediately"
For installation, expand the file in the plugins-folder and activate the plugin in Wordpress.
The current version 0.2 stores "0.0.0.0" as IP address.

