WinMerge Portable 2.6.8 Pre-release 5 (Testers needed)
New release available; topic locked.
New topic since this should be the final pre-release, plus the other topic is getting a bit cluttered.
WinMerge Portable is the popular WinMerge packaged as a portable app. WinMerge is an Open Source visual text file differencing and merging tool for Win32 platforms. It is highly useful for determining what has changed between project versions, and then merging changes between versions. Plus, it leaves no personal information behind on the machine you run it on, so you can take WinMerge wherever you go.