Visitor Visa (Subclass 600)
https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/visitor-600
Electronic Travel Authority (Subclass 601)
https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/electronic-travel-authority-601
eVisitor (Subclass 651)
https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/evisitor-651