gentoo is a free file manager for Linux and other Unix-like computer systems created by Emil Brink. It is licensed under the GNU General Public License.gentoo is written in C using the GTK+ toolkit, and the "two-pane" concept. What makes gentoo stand out are its graphical configurability and its file typing and styling system. Using the latter, gentoo identifies the type of your files and then uses the style you've defined for the type to determine how to display it in listings.