WikiTree.com is a free, shared social networking genealogy website that allows users individually to research and contribute to their own personal family trees, while building and collaborating on a singular worldwide family tree within the same system.  

Geni.com:  Geni is a commercial genealogy and social networking website, owned by Israeli private company MyHeritage. Launched on January 16, 2007, the Web 2.0 company stated that it aimed to create a family tree of the world.[2][3] While family profiles are private,[4] Geni’s mission is to create a shared family tree of common ancestors. By combining research into a single tree that users work on together, users can focus on verifying information and on new avenues of research, rather than spending time duplicating research that others have already done. 

FamilySearch.org is one of the most popular genealogical resources in the world. The site is sponsored by The Church of Jesus Christ of Latter-day Saints and is free and available to the public. Since launching in May 1999, more than 150 million people have visited FamilySearch.org to learn more about their family heritage.

Personal Ancestral File "PAF":  A Windows software app for creating a family tree.  Beginning July 15, 2013, PAF will be retired and will no longer be available for download or support. For full details and for information on alternative products, please visit http://familysearch.org/PAF.  For the last several years, FamilySearch has focused on building relationships with partner organizations to deliver better overall services to the market. This has facilitated better patron experiences with FamilySearch and the partner products. The past several years have seen Ancestral Quest, Legacy Family Tree, and RootsMagic introduced as significantly better alternatives to PAF.

Ancestry.com is a privately held online company based in Lehi, Utah.The largest for-profit genealogy company in the world, it operates a network of genealogical, historical record and genetic genealogy websites.. 

Family Tree Maker: Software, Ancestry used to sell and support Family Tree Maker software, a family tree program that can be installed on your computer. In 2016, Ancestry announced the purchase of Family Tree Maker by Software MacKiev. Family Tree Maker is now sold and supported by Software MacKiev.

GEDmatch is an open data personal genomics database and genealogy website based in Lake Worth, Florida. The website gained significant coverage in April 2018 after it was used by law enforcement to identify a suspect in the Golden State Killer case in California. Other law enforcement agencies started using GEDmatch, making it "the de facto DNA and genealogy database for all of law enforcement,"

MyHeritage is an online genealogy platform with web, mobile, and software products and services that was first developed and popularized by the Israeli company MyHeritage in 2003.[2][3][4] Users of the platform can create family trees, upload and browse through photos, and search through over 9 billion historical records, among other features.[5][6][7][8] As of 2018, the service supports 42 languages and has around 92 million users worldwide.[9][10][11] In 2016, it launched a genetic testing service called MyHeritage DNA. In January 2017 it was reported that MyHeritage has 35 million family trees on its website.

Family Tree Maker is genealogy software for Windows and Mac that allows the researcher to keep track of information collected during research and to create reports, charts, and books containing that information.[5] The software was originally developed by Kenneth Hess of Banner Blue Software,[1] which was purchased by Brøderbund in 1995.[6] It passed through the hands of The Learning Company, Mattel, and others before coming under its current ownership