As well as the standard list (which you can find when you click the button) you should add in:
The Red Cross First Aid App is a free, comprehensive pocket guide to first aid and CPR, giving you access to the most up to date first aid information anytime, anywhere
It is basically a field manual with all kinds of information. That includes how to make shelter, what kinds of plants to avoid, how to make fire, how to prepare food, and even basic medicine. This could be a great app for someone stuck out where they can’t get cell reception and may need to fend for themselves for a little while. This app is entirely free with no in-app purchases or ads.
‘Emergency +’ is a national app developed by Australia’s emergency services and their Government and industry partners, helping people to call the right number at the right time, anywhere in Australia. The app uses a mobile phone’s GPS functionality so callers can provide emergency call-takers with their location information as determined by their smart phone. ‘Emergency+’ also includes SES and Police Assistance Line numbers as options, so non-emergency calls are made to the most appropriate number.