Octobat - Octobat provides automated tax-compliance and accounting for digital businesses.
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.
MasterTax - MasterTax is an online payroll tax processing solution.
DATEV - DATEV data center offers services, such as data analysis, archiving, backup, printing,and sending reports.
Maildroppa - Maildroppa is the GDPR-compliant email-marketing-app for bootstrappers and single-founders. In less than 5 minutes, you can set up beautiful sign-up forms and embed them right on your website without any coding skills.