PCManFM

A fast, lightweight file manager with tabs. It supports desktop icons and wallpapers, so you can set these up all in one program.

Website

Install with
pacman -S pcmanfm

Integrates well with...
Gnome, Xfce and Gtk+ based window managers

Thunar

Xfce's default file manager. It is lightweight, fast and the user interface is intuitive and clean with no useless options. Thunar also includes a bulk renamer, which can rename multiple files at once very quickly instead of renaming each file manually.

Website

Thunar

Install with
pacman -S thunar

Intergrates well with...
Gnome, Xfce and Gtk+ based window managers