Alongside, the release of OS X Mountain Lion preview to developers Apple also rolled out Messages beta for Mac, which is available for general public for testing.
Messages beta for Mac is free app and it is a replacement of iChat, so when you will install it on your Mac, iChat will disappear although its services will be available under Messages.
- Send unlimited iMessages to any Mac, iPad, iPhone, or iPod touch.*
- Start an iMessage conversation on your Mac and continue it on your iPad, iPhone, or iPod touch.
- Send photos, videos, attachments, contacts, locations, and more.
- Launch a FaceTime video call and bring the conversation face-to-face.
- Messages supports iMessage, AIM, Yahoo!, Google Talk, and Jabber accounts.
Download Messages Free Beta