Pinpoint - previously offered by Language Technologies, Inc. (since acquired by some other firm). A static analyzer that looks at source code.
RECODER - again a Language Technologies, Inc offering. While a restructurer, it would also look at the structure of the code as it existed.
COBOL/SF - IBM's restructuring engine. Still offered by IBM (which has not been bought out by CA), again a restructurer, but provides lots of "current structure" analysis. An interesting sidelight is that a version of this is part of the Visual Age COBOL product for OS/2 and (I beleive) NT / Win 95. Mainfram version and PC version have the same functionality. Take your choice of platforms.
Rex Widmer
Builder of software archeology tools and other strange programs to help survive in a legacy based world.