I found this list while looking for Australian brands. Not all of these are Australian owned but this is a good place to start #boycott #buyAustralian
https://en.m.wikipedia.org/wiki/Category:Australian_brands

I found this really nifty website today which lists products and brands by country so you can see where things are made, to shop local products, linking it below in case it helps anyone else

https://ethical.org.au/