FamilySearch - http://www.familysearch.org/ - The Church of Jesus Christ of Latter-day Saints site self-described as "The largest collection of free family history, family tree and genealogy records in the world."
Family Tree at Familysearch[]
Existing trees and birth, marriage and death records have been compiled into Family Tree where the records can be strung together into standard genealogical trees, All trees can be merged into a forest by linking common people and merging data, similar to Geni. This requires a free account to be able to see information in trees and to be able to merge. The data has a feature where it suggests a common format for dates and locations.
How to record Familysearch as a source[]
If the subject has an Ancestral File number ("AFN"), then saving it in the AFN field on the person form will automatically generate a link to the source page on familysearch.
FamilySearch pages may be linked to. Copy the address line from your browser and use this https location in your {{cite web}}, <ref>, or on a form for your source reference entry.
Some contributors have taken screen shots of familysearch pages. (Example screen shot.) The advantage of this approach (which can be used for any site, and is probably advisable for personal sites) is that a record is preserved regardless of changes in the LDS site design. As always, please respect the copyright laws for the country where the information was produced. Generally, only public domain content can be pasted. Note that logos and graphics are copyrighted, so please omit those from such screenshots.
FamilySearch will make you log in from 13 December 2017[]
- Notice from LostCousins newsletter
Summarizing: From that date, you will need to be registered and log in if you want to search their billions of records. It is free. More tips in the actual newsletter - which is also free.