Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Coffee Chats - Beautiful one-page sites that sync to your calendar to easily schedule chats. Plus, Coffee Chats connects with Stripe so you can easily charge for chats turning Coffee Chats into your all-in-one site, booking, and payments solution.
Cron - Cron Calendar.
Calendly for Chrome - Schedule meetings without leaving your inbox
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.