TUFaT
TUFaT is one of the only places on the Internet where you can create a dynamic web-based family tree, and it was the ORIGINAL online family tree builder when first introduced in 1999. With TUFaT, you can start your family tree, and then give your username and password to family members across the world so that they can add their own branches to the tree. You can upload images and biographies of family members, lock records, and export the tree to the popular GEDCOM file format so that it can be used in desktop genealogy programs. Since TUFaT is PHP/MySQL-based, it can manage millions of family records. This version costs $5, and includes 100% of the source code, as well as simple installation instructions and free technical support on the TUFaT.com support forum.