Gentoo

gentoo is a file manager written in C. It uses the GTK+ toolkit,
and the two-pane concept, somewhat inspired by DOpus.
gentoo strives to be very configurable, and also to let you do all 
configuration from a GUI within the program itself. Using advanced 
file typing and styling systems, gentoo determines how to display 
files in its listings, and also how to act on them. The package 
includes a set of over 120 unique handcrafted icons, for many 
different types of files.