Open source web apps with Rails

Does anyone know of any good open source website packages for Rails? I’m
looking for several of the following to compare for a couple of business

Blog Engine
Community site (with forums)
Social News site (like Digg)
General purpose web content (like DotNetNuke)

Does anyone have any suggestions for any of these? As good of a
framework as rails seems to be, I know there have to be some really
slick projects out there. What would you suggest downloading and
experimenting with?

Yes, even I blog now:

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The other day I discovered this really cool resource for finding stuff
on the web. It’s called Google. I don’t know…maybe you’ve heard of
it? :slight_smile:

The number one result: