"gvimdiff
There's also gvim this is a gui version of vi which sports a file
menu and other gui options. And so there's also gvimdiff, which is
a gui version of vimdiff. Gvimdiff can be started from the command
line just like vimdiff by entering
"#gvimdiff file1 file2
"gvim is a great tool in itself and if you need to learn vi it
helps you a lot by giving lists of commands and other helpful
info.
"In gvim you can open multiple files in split screens, this is
normal mode. You can also start a diff from the menu file--split
diff with, this gives you a split screen with all settings like in
vimdiff. Code is folded where it's not different, just unfold by
clicking the + in the sideline."