Gramps - Research, organize and share your family tree with Gramps genealogy software.
webtrees - webtrees - the web based Family History Software - is based on the popular PhpGedView ('PGV') application.
Agelong Tree - Offline family tree software for Windows and Mac
MyHeritage - MyHeritage is a family-oriented social network service and genealogy website.
GenoPro - GenoPro is easy to use genealogy software to create family trees and genograms.
6 Groups - The king of organigrams, family trees, and collaborative tools