No, there is no MotoCast application for Samsung, because it's configured to work only with Motorola devices, but Samsung has an application that works in exactly the same way and provides the same features, and of course, it only works with Samsung devices.
The name is Samsung Link (previously known as AllShare). Use the link posted below to access the start page.
Note: A Samsung account is necessary to log in. Apps will be available after you log-in successfully.