3D ACIS model files (.sat) and IGES ASCII CAD files (.iges, .igs) are one of the most common CAD formats and as such supported in almost all CAD/3D modeling software which could then be used to convert one to another. Typically used for interchange purposes.
Open SAT file Open IGES fileA CAD viewer program with conversion capabilities
A set of 3D modeling tools
A CAD conversion software
A CAD converter with huge format support
A 3D CAD translation software
A dedicated CAD converter