TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
Google Calendar - Spend less time managing your day & more time enjoying it
Quaderno.io - Quaderno for Stripe is the simplest way to bill your customers without programming a single line of code.
BusyCal - powerful calendar app for macOS