You can put WikiTree.com on your short list. This online collaborative genealogy project aims to create a single user-contributed, worldwide family tree. Started in 2008, it has more than 2 million profiles today. Contributors build pedigree charts, either one person at a time or by uploading a GEDCOM file, and can share memories, stories and photographs to create vivid descriptions of relatives and ancestors. Individual pedigrees are merged on a global family tree with the tree creators’ approval, but users control access to the profiles that they add. This enables a unique harmony between large-scale genealogical collaboration and private family history. You can keep information on living people and modern ancestors as private as you want it to be, shared only with family members of your choosing.