LifeLines is a free and open source genealogy program to help with your family history research. It has native versions for Unix-like, Mac, and Windows operating systems. The format of the data as presented to the user for viewing, data entry, and updating follows the GEDCOM format. The real power of LifeLines is its scripting ability. There are a number of LifeLines reports (aka scripts) that generate all manner of output -- ahnentafels, ancestor/descendent reports, formatted ancestor reports, beautiful books of all ancestors, fan charts of ancestors, vital records of all individuals in a format suitable for importing to palm pilot databases (specifically DB which is also hosted here on SourceForge). All the reports are included in the kit. Several reports can do error and sanity checking of data; such as deaths before births, extreme May-December marriages, etc.
WWW: http://lifelines.sourceforge.net/
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