SyncThemCalendars allows you to synchronize calendars across Google accounts
Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
Kin Calendar - The simple and connected calendar
OneCal.io - Sync Outlook and Google Calendars in real-time, share booking links, and view all your calendars in one view.
Calendly for Chrome - Schedule meetings without leaving your inbox
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.