Is there a plugin like Elgg available for Ruby on Rails?

It seems Elgg is only for PHP, it has everything I need for my website. Is there something comparable other than CommunityEngine and LovdByLess? Are these the best alternatives?

Solution

Diaspora was implemented in Ruby on Rails. They've got a lot of nice code there to fork or just even just read. The Gemfile has a lot of useful suggestions. Mostly we roll our own. Check out this related SO post.

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