Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Cardhop - The Mac contacts app you'll want to use.
Live Location in Messenger - Share your location with your friends right in Messenger
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.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Keep In touch - Keep in touch with thousands of people