The upcoming release of genealogy software, iFamily for Leopard looks as though it will include support for displaying Ahnentafel (a.k.a. Sosa-Stradonitz and Kekule) numbering. The post on the iFamily for Leopard Discussion Forums states that the numbers can be displayed in the context diagram and optionally included in ancestor reports.
The image above shows how the numbers appear below the name of the person in each box in the context diagram.