Stripe Atlas Taxes - Help file your business taxes
Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
Taxfyle - Stop doing your taxes, leave it to the professionals.
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
neo.tax - automated R&D tax credits for startups = extra month of burn
Vertex Cloud - Vertex Cloud offers sales and use tax automation solutions.