Pushbullet lets you reply to WhatsApp messages right from your computer. Works with more than just WhatsApp, too! Currently works great with Hangouts, Telegram, Line, and Facebook Messenger as well!
Pushbullet for Android has received an updated that lets users reply to popular messaging apps directly from PC. The service now adds support for WhatsApp, Hangouts, Facebook Messenger, Telegram and LINE messenger. Users can now immediately reply to conversations coming from the aforementioned apps through their desktop.