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WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.

Facebook Messenger is a faster way to message. Reach friends right on their phones, get and send messages fast, message everyone at once and more.

Glympse is the easy way to safely share your location in realtime. No sign-up needed. No social network to manage. Just send a Glympse to anyone via email, SMS, Facebook, or Twitter. Your location is only shared for the duration you specify and then stops. A safer alternative to typical location sharing services.

Use Find My Friends to keep track of your traveling companions when you’re on vacation. Or to see if the kids are home from school. Or to find the friends you’re meeting for dinner.

Trusted Contacts is a personal safety app from Google that opens a direct line of sharing between you and your loved ones.

Life360 helps manage the chaos of your daily family life and lets you know:-Where your family members are located-What safety points and threats are nearby-When your family members have arrived at or left pre-set locations

Pathshare is a beautiful app that helps you share your path in realtime. It was designed to be simple to use and make realtime location sharing a safe experience. With Pathshare, you can easily setup a session with your friends and share your location for a defined period of time. You and only you are in control of for how long you want to be seen by other participants! And there is more: Pathshare will automatically stop sharing your location when the defined time expires. That’s safe and easy!

Open source instant messaging server and clients. Backend in pure Go (license GPL 3.0), client-side binding in Java for Android and Javascript (license Apache 2.0), persistent storage RethinkDB. JSON over websocket (long polling is also available). Tinode is meant as a replacement for XMPP. Overall it's a lot like open source WhatsApp or Telegram.

See who is around you right now and where to find them online!

PocketLocator brings you the ability to update your location on your website from your mobile, smartphone, tablet or desktop computer

Phoner provides business owner, sales people, lawyers, doctors, police officers and others with a second phone number to protect their identity and also gives the convenience of multiple phone numbers on one device.

Do you miss Google Latitude? Hemisphere is here to help. Easily share your location with your friends and family and see where they are instantly.

Miataru is Japanese and means "be found" or "to come across" and it's meant to be a set of tools to allow the user to track locations and choose how to work with the data as well as how data is stored if at all.