Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
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.
Project Fixup - Meet people, not profiles
SavvyCal - A scheduling tool both the sender and the recipient will love.
Palaround - Meet people you should be friends with.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.