Then that would fall under "other." There are hundreds of Australian languages, some of them have become extinct with many others on the verge of extinction. The original language of Sydney is called Dharug or Iyora, originally spoken by the Dharruk people. I have no idea what the original language of Melbourne would be.
There's also English... but that language is from England, not Australia (Australian English being derived from Cockney).

Of course, this thread is about languages other than English.

Jolly good chaps (tally ho)!