Octobat - Octobat provides automated tax-compliance and accounting for digital businesses.
Stripe Atlas Taxes - Help file your business taxes
DATEV - DATEV data center offers services, such as data analysis, archiving, backup, printing,and sending reports.
neo.tax - automated R&D tax credits for startups = extra month of burn
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.