Chat

Some of the most popular chat applications are

WhatsApp
GroupMe
Line
WeChat
Kakao Talk
MessageMe
Kik
Tango
Cubie
Facebook Messenger
Hike
Google Hangouts
Maaii
iMessage/FaceTime
BBM
Rounds
Snapchat
Skype
Viber
Nimbuzz
ChatON
Voxer