Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.
/Lunchbox - Coordinate lunch trips with colleagues and friends in Slack.
sup - The first creep-free way to see nearby friends
Hie Chat - Know what your friends are doing and chat without typing