We use butter [1] for that, and we're liking the product so far. The various nontechnical people (ceo, writers) have been fine with it. Butter build and distribute a gem that just drops into rails and displays your posts. You have to style it, but you get the erb files.

They do have some support for local caching, but investigating that is on my todo list.

One big upside of this design is seo: your blog isn't on blog.domain.com, but wherever you want it on your main site.

[1] https://buttercms.com/