1940 Census http://1940census.net/
Castle Garden http://www.castlegarden.org/
Collections Canada http://www.collectionscanada.gc.ca/genealogy/index-e.html
Cornwall OPC www.cornwall-opc.org
Ellis Island www.ellisisland.org
FamilySearch www.familysearch.org
FreeBMD www.freebmd.org.uk
Freecen http://www.freecen.org.uk/cgi/search.pl
FreeReg http://www.freereg.org.uk/
National Archives of Australia http://recordsearch.naa.gov.au/SearchNRetrieve/Interface/SearchScreens/BasicSearch.aspx
Google www.google.co.uk
Lancs OPC www.lan-opc.org.uk
New Zealand BDM https://bdmhistoricalrecords.dia.govt.nz/home/
NSW BDM http://www.bdm.nsw.gov.au/bdm_fh.html
NSW State Records http://www.records.nsw.gov.au/state-archives/indexes-online/court-records/index-to-criminal-depositions-received-1849-1921
Old Bailey Online http://www.oldbaileyonline.org/forms/formMain.jsp
Papers Past http://paperspast.natlib.govt.nz/cgi-bin/paperspast
Trove http://trove.nla.gov.au/
Commonwealth War Grave Commission http://www.cwgc.org
This is obviously not an exhaustive list of all free sites and not every site may be used in the competition - they're still worth bookmarking.
