P4Merge uses color coding to allow users to visualize the differences between file or images. It allows three-way merging among files, and shows side-by-side file/image comparison.
DiffMerge is a graphical file comparison program for Windows, Mac OS X and Unix, published by SourceGear.
The program is no longer updated. Last version, 4.2.0, released in October 2013, can be still downloaded from the official website
Diffuse is a small and simple text merge tool written in Python. With Diffuse, you can easily merge, edit, and review changes to your code.
SmartSynchronize is a multi-platform file and directory compare tool. It allows you to compare files or perform 3-way-merges, both with the ability to edit the file contents. SmartSynchronize is specialized in comparing directory structures (for example, of software projects)...
An application to help you keep multiple pairs of folders in sync, quickly and easily. View differences between pairs of folders on screen using user defined coloured coding. Folder Sync allows you to utilise a fully automatic sync or manually manipulate the files yourself to...
tkdiff is a graphical diff viewer based on the Tk framework. It is capable of inter-operating with source-control systems like CVS and Subversion to show differences between a local copy and a repository version.