Flychat allows you to read and reply to messages from WhatsApp, Telegram and Hangouts, etc, from bubbles without having to access the applications.
Functions:
It supports multiple messengers (WhatsApp, Messenger, Hangouts, Skype, Telegram, Line, etc.), allows you to customize bubbles with different colors, offers the option to remove ads, etc.
Controls:
If you want to read the entire message, just click on the bubble to access the chat window.