We supply iOS source code for the remote app and the page about it is located here:
http://unity3d.com/support/documentation/Manual/unity-remote.html

The android page unlike that one is much less detailed and source code is not mentioned at all:
http://unity3d.com/support/documentation/Manual/android-remote.html

Also the title of Android platform's remote page is "Android Remote" but the App on Google Market Place is called Unity Remote like the iOS version so it's good to mention this.

It would be good if you could try to get/verify the sources for Android as user said source was only available for iOS.