Meld is a visual diff and merge tool, targeted at developers. It allows users to compare two or three files or directories visually, color-coding the different lines.

Meld

Meld 3.x.y performing a file comparison
Original author(s)	Stephen Kennedy, Kai Willadsen, Vincent Legoll
Developer(s)	The GNOME Project
Initial release	August 8, 2002; 21 years ago (2002-08-08)[1]
Stable release	3.22.0 / September 4, 2022; 19 months ago (2022-09-04)[2]
Repository	gitlab.gnome.org/GNOME/meld.git
Written in	Python, PyGTK/PyGObject
Operating system	Linux and Unix-like, macOS, Windows
Type	Diff viewer
License	GPL-2.0-or-later
Website	meldmerge.org, wiki.gnome.org/Apps/Meld

Meld can be used for comparing files, directories, and version controlled repositories. It provides two- and three-way comparison of both files and directories, and supports many version control systems including Git, Mercurial, Baazar, CVS and Subversion.

Meld is free and open-source software subject to the terms of the GNU General Public License (GPL-2.0-or-later).