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If you only need some static pages in your Rails app, I think you can use something simple like: https://github.com/thoughtbot/high_voltage.
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Sevalla
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In case you want something like Middleman (frontmatter, static compilation, ...), but embedable in your Rails app, Sitepress is really cool solution (you can even run it without Rails!): https://sitepress.cc
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.