Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Free Invoice Generator - A free invoice generator for startups
TransferWise Business Payouts - The international payouts platform for businesses and banks.
Invoice.to - A simple & beautiful invoice generator with Stripe & Paypal
InvoicePlane - Free and open source invoicing application to host on your own server.
Free-Invoice.co.za - Free Invoice Software | Free online tool that helps small businesses to generate free invoices and manage their contact list. It can be used as an alternative to expensive invoicing software and online invoicing applications