UI Diff tool - diffmerge

download link - http://download.sourcegear.com/DiffMerge/3.1.0.15888/Apple/DiffMerge.3.1.0.1002.dmg

how to use :

1. download dmg to a location
2. explode/install it, but double clicking on it, it will ,
you will find a commandline folder in the window, copy it over to a loc

3. To install just drag the DiffMerge application to the Applications folder.

To make it easier to use DiffMerge from the command line, we have included
an example shell script and a man page. See the CommandLine folder.
[] Copy the shell script to some place like /usr/bin/diffmerge or
/usr/local/bin/diffmerge. It should have mode 755.
[] Copy the man page to /usr/share/man/man1/diffmerge.1. It should have
mode 644.
These stesp are completely optional.