Sling Media has finally officially announced that they will provide a Macintosh Player. Last week at CES 2006, Sling Media mentioned the Macintosh Player should be announced during MacWorld and it was. Unfortunately, a Linux Player does not seem likely currently as there is not enough interest from consumers.
So the tally… Sling Media works on Windows CE, Windows and now Macs while Locationfree works on Windows, PSPs and Locationfree TV tablets. I think Sling Media wins the supported clients competition.