ExamDiff
This program displays two files side by side, highlighting the differences. ExamDiff's handy interface offers several navigation schemes: buttons taking you to the previous or next change, a drop-down list of lines, or mouse functionality going directly to any line. It lets you scroll files in tandem or separately. You can customize the colors the program uses to mark added, deleted, and changed lines. When running a comparison, you can ignore white spaces and case differences. It outputs results as standard Unix DIFF files. Unfortunately, no manual is available. This free tool is mainly useful for developers.