Rainmaker - Rainmaker allows you to make your Google Contacts better.

vatlayer API - Free VAT Validation & EU VAT Rates API

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

VatStack - Simplify VAT & GST for your digital business.

dip - accountability groups for developers

MFLicenseCenter.com - Connect to fuel tax licenses for tax determination, return preparation, and reporting compliance.