Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts
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.
Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.
Reservio - Reservio is a simple online booking and appointment scheduling application.