If you'd like to see how your app runs on OpenShift and it's currently sitting on Heroku's PaaS, this is the go-to tutorial…
How to Migrate Your Heroku Ruby Application to OpenShift
It's also pretty recent – released in June. I think that Heroku and OpenShift are both pretty similar in how they give you a nice bit of free computing space if you just want to deploy something fast and simple, like a static Jekyll site. But this tutorial might also be targeting anyone who's fed up with Heroku as well.
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