The best open source alternative to WinMerge is Meld. If that doesn't suit you, our users have ranked more than 50 alternatives to WinMerge and 15 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to WinMerge are KDiff3 (Free, Open Source), WinMerge 2011 (Free, Open Source), Compare (Free, Open Source) and WinMerge JP (Free, Open Source).
tkdiff is a graphical diff viewer based on the Tk framework. It is capable of inter-operating with source-control systems like CVS and Subversion to show differences between a local copy and a repository version.
WellCompareDir is a tool to compare and select images with the same name from two folders, and copy to a third folder. - Compare images before and after batch modifications of contrast, color balance, white balance and such.
It includes possibilities such as: * converting a source file into a language-agnostic tree format * export the produced trees in various formats * compute the differences between the trees * export these differences in various formats * visualize these differences...