Here you will find a listing of web sites for Open Source conferences held in Australia.
Regular Websites
An annual and international conference for Free and Open Source Software for Geospatial; presented by OSGeo. - FOSS 4G
http://foss4g.org/
linux.conf.au (LCA) is Australia's national and annual Linux and Open Source conference; held in a different city every year, coordinated by Linux Australia and local Australian Linux User Groups. - LCA
http://linux.conf.au/
CeBIT Australia is an annual event for Open Source Information and Communications Technology (ICT) developers, marketers, and more. Provides event details, and more. - Open ceBIT Expo
http://www.opencebit.com.au/
OSDC, the Open Source Developers' Conference, is an annual conference held in Australia; contains information about the conference, as well as its bimonthly meetings, user groups, and other associated groups concerned with Open Source software, the movement, and more. - OSDC
http://www.osdc.com.au/
An annual and national conference of the Australian Computer-Human Interaction Special Interest Group (CHISIG) of the Human Factors and Ergonomics Society of Australia (HFESA); a forum to discuss all aspects of openness, open borders, open participation, Open Source software, open architecture, and more. - OZCHI
http://www.ozchi.org/