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.
Chudo Virtual Spaces - Play around, meet friends, study or party with avatars!
SavvyCal - A scheduling tool both the sender and the recipient will love.
Friendship Project - Friend-finding app based on thought-provoking questions
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
FreeTime - Calendly for friends