Gramps - Research, organize and share your family tree with Gramps genealogy software.
Ancestry - Discover your family history and start your family tree.
webtrees - webtrees - the web based Family History Software - is based on the popular PhpGedView ('PGV') application.
FamilySearch.org - Free Family History, Family Tree, and Genealogy Records and Resources from Around the World
Ahnenblatt - Ahnenblatt is genealogy software for Windows. (Use Portable Version for Linux with Wine)
Family Echo - Draw your printable family tree online. Free and easy to use, no login required. Add photos and share with your family. Import/export GEDCOM files.