Rails? Symfony? Cotonti!
CCL is pretty outdated by now. It's worth a decent rewrite, considering recent Gert's efforts with SimpleORM, changes in Siena and best ideas from other frameworks, still keeping it minimalistic.
There hasn't been much interest in it and I didn't have projects large enough to motivate me into rewriting it. But it'd be an interesting challenge.
May the Source be with you!