Stripe Dashboard for iPhone - Track and manage payments on the go
Bench Accounting - Bookkeeping done for you
Nomod - Accept card payments on your phone, anytime, anywhere
Synder - AR Automation
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
InvoiceApp - Beautiful online invoicing software for small businesses