Ready to use blogs, forums, newsletter features in Rails

Hi,

I am trying to learn more about RoR to implement a solution that features blogs, forums, data acquisitions, newsletter. After spending some time learning Ruby, I am impressed with ease of programming with RoR. But I wonder if there are any ready to use packages for forums, blogs, newsletter that I can include in my website.

Thanks for the great help till now!

Regards, swiftie