Difftool for Ubuntu like OS X's Opendiff [closed]

If you're after a graphical diff command, you should give Meld a go. It's a visual diff and merge tool. I think it is present by default on Ubuntu systems

I use KDiff3. It is one of the best tools available for comparison or merging two or three text input files or directories.

"I'm a vim user and I like the vim diff feature.
It's a vertically split screen with one vim at each side.
Git knows how to invoke it after you configure it thus:

git config --global merge.tool gvimdiff

On each side of the diff I have all the power of vim, configured as I like it.
DON'T DO THIS AT HOME IF YOU ARE NOT A VIM USER!
Although very powerful and highly usable, vim is known for catering from quite a different paradigm as compared to the usual GUI editors like Notepad and all the many excellent other editors based in the same paradigm.
Before using this feature you should get acquainted with the vim UI. It easy, it is logical, but it's different. All the caveats about people reacting to change apply here.
Oops I might sound like a vim hooligan! Not so: I like diversity, even at the text editor level. So does Git."