Legacy Family Tree is genealogy/family history software program for recording your family history, ­your ancestors and the past.

There are a couple of Linux alternatives:

• Gramps (Debian package) - XML-based, written in Python. Good data-model (reads all of GEDCOM 5.5).
• GeneWeb (Debian package) - Written in OCaml, with CGI interface. Simpler data-mode, but handles 400k-name families without trouble.