The (often associated with the "CYGiSO" release group in 2021) is an older version of the specialized MEP (Mechanical, Electrical, and Plumbing) design software now known as Graphisoft DDScad .
This is the name of a "warez" scene group known for bypassing software protection to create unauthorized releases. DDS CAD Version 7.2 Multilanguage-CYGiSO 2021