NCI publishes Optical Astronomy datasets using IVOA compliant services, such as an installation of the CSIRO ASKAP Data Archive TAP data service.
The MACHO data services are described here: http://macho.nci.org.au/. The major service is the TAP service.
The Skymapper data service is fully described on the Skymapper web site. NCI supports the VO services including an IVOA catalogue service (including TAP), Cone Search (including SCS), and Image cutouts (including SIAP).