Popular alternatives include Quantum Invoicing, InvoiceOcean, Billbooks, GetMyInvoices.com and Billogram.
Key factors include Multi-Currency, Customizable Invoices, Invoice History, Online Invoicing, Online Payments and pricing.
Tools like Invoice2go, AND.CO, BillQuick, Invoicera and OneBill are best for small businesses for Billing and Invoicing Software.