Pick - The simplest way to schedule a time to meet
Schedulr - Schedulr makes it easy to meet with others w/out the headache of back-and-forth emailing.
Meekan - Connecting the world's calendars
Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
LettuceMeet - The easiest way to schedule group meetings.
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.