Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
neo.tax - automated R&D tax credits for startups = extra month of burn
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Stripe Atlas Taxes - Help file your business taxes
Quaderno.io - Quaderno for Stripe is the simplest way to bill your customers without programming a single line of code.
Quarterly Tax Calculator for Freelancers - See how much you owe to state and federal in 7 sec