ZipBooks - ZipBooks is online accounting software for small businesses. 100% free, forever.
Invoice.to - A simple & beautiful invoice generator with Stripe & Paypal
Every. - Simplified finances for self-employed people.
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
Momenteo - Freelancer accounting and invoicing made simple
Free Invoice Generator - A free invoice generator for startups