Midnight Commander - GNU Midnight Commander is a visual file manager, licensed under GNU General Public License and...
Beyond Compare - Beyond Compare allows you to compare files and folders.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Thunar - Thunar is a modern file manager for the Xfce Desktop Environment.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.