Pushbullet enables you to see your calls and texts on your computer and easily send links and files from your computer to phone. This means you can see who's calling or read and reply to text messages even if your phone is on silent or in another room.
iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5.
First Google Voice client for the Mac.
Message your friends, share files, and call other users directly from your Mac.
Allows you to communicate and share files with others.
An unofficial and privacy-focused Facebook Messenger application.