Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
Flexibits - Makers of Cardhop, Chatology, and Fantastical.
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
BusyContacts - BusyContacts is a contact manager for macOS.
Add to Calendar Link Generator - Create buttons for Google Calendar, Office 365 and Apple Cal