Three quite different things get called a ferry in Australia: a metropolitan service on Opal fares, a free government punt crossing a river on a cable, and a commercial boat carrying visitors to an island. They are run by different bodies, priced on different principles and published in different places, so this site treats them as the different services they are.
The source for each page is whoever actually runs the crossing — Transport for NSW, a state transport department, a council, or the operator — read directly and dated. Several Australian government sites refuse automated requests, so those pages were read in a browser by hand; that is noted in the research file for whoever checks them next.
Some numbers are deliberately absent. An operator may quote a crossing time that its own timetable contradicts, or show a headline fare that turns out to include an airport bus, or publish a weight limit that no longer applies. Where the evidence does not hold, the figure does not go on the page, and the open question is recorded instead.
What is sold alongside a ferry gets separated out too: national park fees, island admission, resort packages and zoo tickets are not part of the fare, and this site does not blend them into one. Each page carries a next-check date. Lauttainfo Australia sells no tickets, is tied to no operator, and is funded by advertising.