Mobile platforms such as iOS, Android, and Windows Mobile.
The first salvos in Bungie's anniversary news assault have been fired, and one round has a decidedly Pfhorlike flavor.
Bungie is announcing that Daniel Blezek has ported Marathon 1 to iOS; efforts started in 2010 and apparently the app is ready now-- I don't see it in the iOS App Store just yet, but I'm going to keep looking.