Billdogg - Beautifully simple invoicing for freelancers
vatlayer API - Free VAT Validation & EU VAT Rates API
Free Invoice Generator - A free invoice generator for startups
MFLicenseCenter.com - Connect to fuel tax licenses for tax determination, return preparation, and reporting compliance.
Bookipi Invoice App - A minimal, beautiful invoice app for freelancers
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.