meld
Links
http://meld.sourceforge.net/ Meld : Diff and merge tool.
Issues
Trying to run meld from the command line:
No module named pygtk
Meld requires pygtk 2.8.0 or higher.
I was trying to run meld from within a python virtual environment. To solve the problem, deactivate the virtual environment or open a new console.
Subversion
svn diff --diff-cmd meld templates/search.html