Submissions are by hard copy only. Send the first 3 chapters and a brief (1-page) synopsis. Text Publishing Australia accepts non-fiction and fiction manuscripts, including middle grade and young adult. They do not accept submissions from outside Australia, New Zealand or Oceania (unless the author has a connection to the region such as citizenship or residency). They accept both children's literature and adult books.
Penguin Australia accepts unsolicited manuscripts the first week of every month. It also handles sales for Guinness World Records. They publish commercial and literary fiction, children's and YA fiction, picture books, Australiana, history, biographies, cooking, health and self-help, sports and travel. Pan Macmillan is a major Australian publisher with a wide range of titles under group imprints, including Macmillan, Pan, Picador, Plum, Momentum, Macquarie Dictionary Publishers, Pancake, St Martin's Press, Tor, Forge, Griffin and Sidgwick & Jackson. Pan Macmillan Australia accepts electronic manuscript submissions directly from writers every day of the week.