Thunar is a file manager for Linux and other Unix-like systems, written using the GTK+ 2 toolkit, and shipped with Xfce version 4.4 RC1 and later. Thunar is developed by Benedikt Meurer, and was originally intended to replace XFFM, Xfce's previous file manager. It was initially called Filer but was changed to Thunar due to a name clash.
The main goal of the Thunar project is to create a file manager that is fast, clean, and easy to use. It is designed to start up faster and be more responsive than some other Linux file managers, such as Nautilus and Konqueror. Accessibility, another goal of the project, is accomplished using Assistive Technologies (i.e., GNOME Accessibility Toolkit). Like the rest of Xfce, Thunar is designed to comply with standards, such as those stated at freedesktop.org. Thunar is simple and lightweight by design, but its functionality can be extended through plugins.
Thunar is the Old Saxon name of god of thunder in Norse mythology, and uses Mjölnir, Thor's hammer, as its icon.