if you need to source some government data then this site may help http://nationalmap.gov.au. The about section describes it as follows:
The NationalMap is a website for map-based access to spatial data from Australian government agencies. It is an initiative of the Australian Government’s Department of the Prime Minister and Cabinet and the software has been developed by NICTA working closely with the Department of the Prime Minister and Cabinet, Geoscience Australia and other government agencies.
The NationalMap is a fully open architecture. When you access data through it, you are typically accessing the data directly from the government department or agency which is the custodian of that data.
Similar to what NZ government setup years ago at https://data.linz.govt.nz…but were missing the features where you can extract data from the service :( Maybe a future release.