
G'day Terranaut and welcome to Ice In Space!
Not a website or app, but I highly regard Astronomy Australia yearbook magazine. They are published yearly and always have great information about upcoming southern hemisphere astronomical events.
The app I use is Sky Safari Pro. You have to pay for it but money well spent! Once you input your location you can check their excellent star maps to see what's interesting that night. All the best
Clear Skies
Joe