Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Google Calendar - Spend less time managing your day & more time enjoying it
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.
Itsycal - Itsycal for Mac. Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app. You can also create and delete (but not edit) events. Download Itsycal for macOS 10.
Vertex Cloud - Vertex Cloud offers sales and use tax automation solutions.