Cyndi's List - Databases: Searchable Online

Ancestry.com - Compiled Genealogy - Trees & Community

Searchable indexes; database results and some digitized images available with fee-based subscription.
FamilySearch

FamilySearch is the largest genealogy organization in the world. Millions of people use FamilySearch records, resources, and services each year to learn more about their family history. The site is free for everyone to use.
- Search - Records
  - Free Family Trees - Search User Submitted Genealogies
    
    User Submitted Genealogies is a set of lineage linked conclusion trees provided to FamilySearch by users. This data comes from the Ancestral File, the Pedigree Resource File and other user submissions.
GeneaNet Genealogical Database Network

Database indexing surnames from before 1850 & corresponding contact information - online or offline.
The JewishGen Family Finder (JGFF)

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