FamilySearch - provides record indexing and pedigrees for tens of millions of individuals. We are a FamilySearch Affiliate Library, which means when you use familysearch.org at our library, you have access to millions of digitized records and images which are only available at FamilySearch Family History Centers and other affiliate libraries. You will need to create a free account if you don’t already have one.
USGenWeb - free access to state and county level data