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

Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.

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.

Quaderno.io - Quaderno for Stripe is the simplest way to bill your customers without programming a single line of code.