itax is a free(www.fsf.org)/open source multi-platform implementation and extension of the Australian Tax Offices(ATO) ‘e-tax’ software.
phase 1 of this to create a free/open source multi-platform implementation of the ATOs e-tax
phase 2 is to extend e-tax
NOTE: itax is currently still in its proto-typing stage. It can be installed and 'used' but its not ready for production use.