推荐一个文本比对免费软件：textdiff

xmubingo

下载地址：http://www.angusj.com/delphi/textdiff.html

TextDiff

Version: 4.5
Last updated: 2 June 2008
Copyright © 2001-2008 Angus Johnson

Main features:freeware
customizable color highlighting of differences
drag and drop enabled
accepts commandline parameters for file and folder comparisons

Folder compares:
  double click modified (green) files to view file differences

File compares:
  a very fast compare algorithm
  space characters and case can be ignored during a compare operation
  also highlights differences within individual lines.
  easy navigation between differences
  easy two-way merging
  in-place text editing
  search and replace text
  multiple undo/redo of text changes
  supports unicode text files
  generates a report of file differences

Download TextDiff
(870kb - includes Delphi source code and 2 other simple demos)