I’ve been using an opensource CMS application recently called Mambo.
We needed some kind of CMS for our own site and after looking around, weren’t really happy with what was out there..
The sites based on *nuke seem so chaotic. But not Mambo. The sites created with Mambo are nicely designed and user friendly. But the admin interface is absolutely brilliant! Its a well designed system with a great community. Theres quite a few templates around which quite nice to look at. Also there are some components and modules around which are actually useful for non-community sites.
If you need a nice CMS and more, take a look…and prepare to dance…