What are good diff tools that are self contained and can be used from a

What are good diff tools that are self contained (small in size and in as little files as possible), and can be used from an USB with no extra开发者_开发知识库 fuss ? Not looking for command line ones.

So far I found diffuse ... any more like it ?

There's a version of the open-source WinMerge which has been optimised for running from a USB stick by the kind folks at PortableApps.

I have no idea whether this meets your size/OS requirements.

VimDiff! Vim is available on multiple platforms (including Windows XP) and is able to three-way diffs and merges. Never leave home without it!

Beyond Compare is absolutely brilliant: http://www.scootersoftware.com/