Meld is a graphical tool for comparing different versions of files and folders. While it is primarily written for developers working with folders of source code, it can also be used to compare any other text-based format (such as HTML, XML, and JSON). It provides both two-way comparisons (version A vs. version B) and three-way comparisons (versions A and B against a common ancestor), along with tools to merge sets of changes together. When applied to folders of files, Meld can quickly highlight which files have been modified and how they have been changed. Meld may also be used as a GUI front end for several popular version control systems including Git, Subversion, and others. Windows users can download a Meld installer directly from the Meld website. Linux and BSD users can locate Meld packages in their system's package repositories. MacOS users can install Meld using MacPorts, Fink, or Brew.