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The Master Genealogist (TMG) is a popular genealogy software for Windows that was discontinued at the end of 2014 (The announcement.). The Master Genealogist is able to be customized for data entry
through user-defined event, name, and relationship types.
TMG uses DLL's from Visual Fox Pro (VFP) so many issues associated with VFP affect TMG.
TMG's version history can be found on Wikipedia
There are a couple of Linux alternatives: