Heaps - Tinder with your friends. Party in a group.
Cardhop - The Mac contacts app you'll want to use.
Double - Tinder for double dates
Keep In touch - Keep in touch with thousands of people
Radiate - It's not Tinder for festivals. A new way to meet people.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.