Stripe Dashboard for iPhone - Track and manage payments on the go
Killbill - Open-Source Subscription Billing and Payment Platform
Nomod - Accept card payments on your phone, anytime, anywhere
Muni-Link - Cloud-based utility billing software
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
Recurring Payments - No need to create invoices. No need to remind clients to pay