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Envoice - Send invoices and get paid on Paypal, Payoneer, Stripe and Square.
flyceipts - A fresh look at digital receipts & other documents.
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
Invoice Bus - deliver all your invoices, price quotes, follow-ups, and thanks notesautomatically
QuickReceipts - A mobile app that automatically tracks, organizes, and stores your digital receipts privately on your device.