It enables you to have unlimited one-on-one chats, group chats, voice and video calls and that too free of cost. Developed by Naver, this simple and hassle –free app has remained fairly popular in many countries. More than 200 million users have been using this revolutionary app to connect with others and communicate with them. Have free calls and expressive chats on your PC by installing LINE for PC! Line app is such an instant messeging app, which has been competing with other popular communication apps used in various mobile platforms.