000 is the national emergency number in Australia.
Lifeline (https://www.lifeline.org.au/) is a 24-hour nationwide service that provides access to crisis support, suicide prevention and mental health support services. It can be reached at 13 11 14. They also offer an online chat service.
Kids Helpline (https://kidshelpline.com.au/) is a 24-hour nationwide service that provides access to crisis support, suicide prevention and counselling services for Australians aged 5–25. It can be reached on 1800 55 1800. In addition, Kids Helpline does also provide online chat services.
Beyond Blue (https://www.beyondblue.org.au) provides nationwide information and support regarding anxiety, depression, and suicide. It has a helpline which can be reached by calling 1300 22 4636. The helpline is available 24 hours a day, 7 days a week. In addition, the organization also provides online chat from 15-24.