What has become one of the most popular phone apps for messaging internationally is becoming available via a web browser on the desktop (an extension). The browser version is a little odd as it needs an active phone session to operate which it then mirrors. All the messages still happen on the phone, with the desktop as an interface. Another odd quirk is that the desktop does not work with Apple iPhone, just Android, Blackberry and Windows. The company is blaming Apple limitations for the lack of the new service.
On your Android phone, the popular messaging app WhatsApp now is providing end-to-end encryption. The Open Whisper Systems technology will move to iOS soon also. Whisper Systems was purchased by Twitter four years and the Open Whisper Systems is the open source off-shoot. With over 600 million users, keeping messages and pictures save from hackers has become more important every month with the NSA and hackers getting ahold of celebrity photos from Apple cloud services.