Wirize - Payment checkout for freelancers
Invoice.to - A simple & beautiful invoice generator with Stripe & Paypal
ACH payments with Stripe - Accept bank payments with a few lines of code.
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
Giftbit Payment API - Stripe for gift cards
Invoice Template - Create beautiful looking invoices in seconds