The game is now working on Linux and Mac OS X!
You can download the binary version by clicking the OS icon the download section in the top right of the homepage. Since these versions are new, your report is very important for us to know if it works or not on your computer. Click on the (read me) link under the download icon to send a report.
Since Mtp Target is under GNU GPL licence, you can access the source code on the SourceForge website or you can just click on the source icon on the download section.