vatlayer API - Free VAT Validation & EU VAT Rates API
Bench Accounting - Bookkeeping done for you
MFLicenseCenter.com - Connect to fuel tax licenses for tax determination, return preparation, and reporting compliance.
InvoiceApp - Beautiful online invoicing software for small businesses
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Blockpit - Keep track of your crypto portfolio & taxes in one place