Aldfaer is a Dutch genealogy program where you can make family trees, but with templates you can make it English(there is already a Frisian template, but not an English.). A few functions are:

• Personal information
• Information about the biological parents, the adaption parents.
• Pictures, sounds, notes
• Birth information
• Relationship type, information, start date
• Export to GEDCOM

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.