Meld is an open source piece of software designed from the ground up to act as a visual diff and merge utility that integrates well with a wide range of Concurrent Versions Systems (CVS). It is distributed along with the GNOME desktop environment, installable as a standalone application
Features at a glance
Key features include the ability to edit files in-place, perform two-way and three-way merge and diff operations, view comparison updates on the fly, support for syntax highlighting, built-in regular expression text filtering functionality, as well as support for navigating between merges and diffs.
In addition, it lets the user to view local and global differences with changes, conflicts and insertions marked, compare two or three folders using the file-by-file method, manage files, filter out folders and files, and merge and visualize independent changes of a single file.
Another interesting feature is the built-in support for a plethora of version control systems, among which we can mention the popular Git, Mercurial, Subversion, and Bazaar. Also, the program includes basic version control actions and a command-line interface.
Under the hood
Meld is originally written for the GNOME desktop environment, but it can also be downloaded and installed as a standalone application in other open source window managers, no matter the GNU/Linux distribution used.
It is distributed a source archive, which can be configured, compiled and installed on a wide range of Linux-based operating systems. However, the fastest and easiest way to install Meld is from the default software repositories of your distro.
Summing up, Meld is a great file/folder diff and merge tool for the GNU/Linux ecosystem, a unique application that combines simplicity and easy of use with a powerful and versatile architecture. It is oriented towards programmers and software developers, supporting both 64-bit and 32-bit hardware platforms.