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Slimvoice - Insanely simple invoicing
flyceipts - A fresh look at digital receipts & other documents.
Zoho Invoice - 100% free online invoicing software for small businesses.
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
Simple Invoices - Never Wait For Clients To Pay You Again!
QuickReceipts - A mobile app that automatically tracks, organizes, and stores your digital receipts privately on your device.