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You may want to look at houston [0] and/or helios [1].

For Ruby I definitely recommend RPush: https://github.com/rpush/rpush. Helios hasn't been updated in a very long time and has a massive list of unresolved issues.

Thanks. I hadn't seen rpush and it looks great.

If you're interested in push notifications based on analytics data, check out Pushpop [1] (doesn't explicitly support iOS yet)

https://github.com/keenlabs/pushpop

Grocer is the most stable APNS gem I've used https://github.com/grocer/grocer