For Business related matters
1. ABN lookup http://abr.business.gov.au/
2. ASIC http://www.asic.gov.au/
3. ATO htps://www.ato.gov.au/
4. Small business superannuation, Clearing house https://sbsch.gov.au/
For Land tax, Properties, Shares, Stamp duty related matters:
5. OSR NSW for stamp duty, land tax and first home buyer grant http://www.osr.nsw.gov.au/
6. Queensland Treasury https://www.treasury.qld.gov.au/taxes-royalties-grants/index.php
7. State Revenue Office VIChttp://www.sro.vic.gov.au/
8. ACT Revenue Office http://www.revenue.act.gov.au/
9. Revenue Office SA http://www.revenuesa.sa.gov.au/
10. Department of finance WA http://www.finance.wa.gov.au/cms/State_Revenue.aspx
11. Department of treasury & finance NT http://www.treasury.nt.gov.au/TaxesRoyaltiesAndGrants/Pages/default.aspx
12. Department of treasury & finance Tasmania http://www.sro.tas.gov.au/domino/dtf/dtf.nsf
For listed companies related matters:
13. Delisted companies http://www.delisted.com.au/
14. yahoo finance to check share price past and present https://au.finance.yahoo.com/
For Online accounting software matters
15. MYOB online login https://my.myob.com.au/Pages/Default.aspx
16. XERO online login https://www.xero.com/au/accounting-software/dashboard/
17. Quicken online login https://go.qbo.intuit.com/c37/v1612.653/0/login?redirect=true