What is Meld?
Meld is a visual diff and merge tool targeted at developers. Meld helps you compare files, directories, and version controlled projects. It provides two- and three-way comparison of both files and directories, and has support for many popular version control systems.
Meld helps you review code changes and understand patches. It might even help you to figure out what is going on in that merge you keep avoiding.
Getting it
You can run Meld without installing it. Just extract the archive and run the meld file in the bin folder.
Meld is packaged for most Linux/Unix distributions, including Fedora, Ubuntu, and Suse. Unless you want the absolutely latest version, you should install Meld through your package manager.
Meld works on OS X and Windows (with some caveats). On OS X, you can get Meld from MacPorts or Fink. For Windows, there is a not-yet-official installer, or we have notes on how to get Meld running if you want to do it yourself.