Google Hangouts is an instant messaging and voice calling app. It allows you to message your google contacts. It has more than 300 emojis to make your chatting more interesting. It allows you to add 150 people in conversation. You can enjoy video calling with upto 10 people at the same time. It allows you to share videos, GIFs, images etc. You can make international calls for free. It supports Android, iOS, Windows, Mac & Chrome extension.