NoPass.me - Open-source identity verification

Stripe Atlas Taxes - Help file your business taxes

Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.

Taxfyle - Stop doing your taxes, leave it to the professionals.

Civic Token - Access to identity verification via the blockchain

neo.tax - automated R&D tax credits for startups = extra month of burn