WikiTree.com
The WikiTree community is growing a free worldwide family tree. The site is 100% free. There are no premium memberships. All content is contributed by the users and you can keep copyrights. You can also keep modern profiles private or even hidden altogether. As you go back in time the profiles become more collaborative. Merges are done individually and profile managers on both sides have to agree to them, but you are supposed to merge duplicates. The community uses an Honor Code to keep things in order. WikiTree started in 2008 and has been growing slowly and steadily. It's now widely respected in genealogy circles and has thousands of active contributors.
