Check out Adva cms
note: now I'm adva new dev, so I might not be very objective :-)
If you have used Radiant or any other ror based cms then try out very new project Adva CMS.
It's kind of next evolution compared to Radiant.
Firstly, it keeps your main app directory clean for your own project, so upgrading Adva is a bit easier than with other cms where all app files are together with cms ones.
Secondly, admin main panel is trying to be as agnostic as possible. So all engines are visually equal to other ones such as blog, forum or wiki.
However adva cms is not ready yet. It's still alfa but under active development. By the way, it has got already over 2000 specs :-)
Anyhow, I'm already big fan of adva cms and trying to help as much as I can to develop it.
