I'm working on RailsBilling - it's a Ruby gem for fast Stripe subscriptions integrations. It allows you to implement subscriptions in your app in hours, instead of months.
You see, Stripe is very powerful, but also very complex. Coding a straightforward subscriptions implementation will take you a couple weeks at best.
That is without handling all those edge cases like: prevent starting a paid subscription without a billing card on file (yes, you read that right)!
The gem is ready, I'm currently working on getting the website up. If you're working with Rails and need a solution for subscriptions get in touch at hacker.news@railsbilling.com - I'd love to chat!