Gramps - Research, organize and share your family tree with Gramps genealogy software.
Ancestry - Discover your family history and start your family tree.
MyHeritage - MyHeritage is a family-oriented social network service and genealogy website.
WikiTree.com - The WikiTree community is growing a free worldwide family tree. The site is 100% free.
Ahnenblatt - Ahnenblatt is genealogy software for Windows. (Use Portable Version for Linux with Wine)
MacFamilyTree - MacFamilyTree and MobileFamilyTree - Genealogy for your Mac and iOS