The technology to get Scramjet engines running was developed by the University of Queensland which was further developed by DARPA. Also, an Australian company has now designed a Scramjet engine that is much simpler (with a lot less moving parts) and can be 3D printed so the cost will be brought down to a level suitable for use in missiles so Australia is contributing to the project.
JeanKhul, you appear to have an issue with the contract cancellation but it was the right decision and it occurred at a point before further commitments were required. As part of the compensation, Naval Group now has a massive assembly building in Cherbourg, France that was built by French workers and paid for by Australian taxpayers - they are still winning despite the cancellation.