Linux port of winmerge
Windows visual diff and merge for files and directories
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grimmdp
Sorry for the late reply.
Linux support is something which has been many times discussed between developers. But there is lots and lots of work to do for it. And not only the initial porting work but then the maintenance work of two platforms.
With current development resources that is unfortunately not realistic goal. We have done some work, but that is just small first step.
I'm closing this item as there are much older feature request item with more information:
#851438 wxWidgets (Linux) port
http://winmerge.org/rfe/851438