TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Envoice - Send invoices and get paid on Paypal, Payoneer, Stripe and Square.
Cotter - One-click phone number login and checkout
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Invoice Bus - deliver all your invoices, price quotes, follow-ups, and thanks notesautomatically