Xmd 0.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Audio & Video Tools, more precisely General. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Xmd is open Source NetMD functionality. It contains three components: libomd - A C library for accessing NetMD functionality. This library is intended to provide the low-level NetMD functionality that an application might need in a robust and somewhat object-oriented fashion.
omd - A command line application for accessing NetMD functionality, built on top of libomd. This application allows playback control and track/group name editting.
Xmd.
You may want to check out more Mac applications, such as OsiriX MD, which might be related to Xmd.