Recurly handles our subscription plans. The advantage over Stripe is that there is a system called Dunning Management built into Recurly. If the client’s credit card doesn’t process the payment, it automatically triggers a series of actions including retrying the card and sending email notifications. This is possible in Stripe as well, but you need to buy a service from an external vendor.
I love this tool that I recently bought, Grum, through a deal site: AppSumo--managed by Noah Kagan who created SumoMe. Grum enables you to schedule Instagram posts. We use Instagram more than any other social media tool.