XcelTax - Excel spreadsheet program for the preparation of tax returns. Covers IR3, IR4, IR6, IR7, IR9 and IR10. - http://www.xceltax.co.nz/
TaxWebNZ - Complete your taxes on the Internet and electronically file with the Inland Revenue Department. - http://www.taxweb.co.nz/
Quicktax by Pebesoft - Professional, individual, partnership, and trust/estate tax packages that are Inland Revenue certified. - http://www.pebesoft.co.nz/