According to Lifewire: The 8 Best Free Genealogy Websites of 2019 https://www.lifewire.com/best-free-genealogy-websites-4163831. They include what they like and don’t like about each site.
Some of these you may be familiar with. Others you may not be aware the site exists or that it’s free if you know about it. I wasn’t familiar with #7, but I haven’t done a lot of Canadian genealogical research.
I am not going into near the detail Lifewire included; see the above link for more specifics.
Starting with #1 on their list: FamilySearch: https://www.familysearch.org/.
#3 Access Genealogy: https://www.accessgenealogy.com.
#4 Allen County Public Library: http://www.genealogycenter.org/Databases/FreeDatabases.aspx.
#7 TONI: Canadian genealogy: https://ogs.on.ca/databases/toni/.
#8 National Archives and Records Administration (NARA): https://www.archives.gov/research/genealogy.