tbmerge

tbmerge is a program treats tables in a database-like manner, allowing to determine which of the fields/rows are present in either both or only one of the processed text files, and which of the cells common to both have different values, also including the possibility to do numerical comparison of cell values. Compared tables can be merged together using several possible methods.

http://a.fsdn.com/con/app/proj/tbmerge/screenshots/2a.png

See also