RootsMagic is a family tree program available for Windows Vista, XP, 95, 98, ME, NT, and 2000.

 

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.