SlackBuilds.org/desktop/peksystray

Peksystray is a small system tray (also called notification tray) designed
for all the light window managers supporting docking. As more and more
applications use a small icon in the system tray to provide additonal
functionalities and information, it becomes useful for everyone to have
access to them. While "heavy" window managers (Gnome, KDE...) come with a
systrem tray embedded in the rest of the desktop, lighter window managers
(WindowMaker, fluxbox...) don't have this feature. Peksystray is a very
simple and light implementation of a system tray for any window manager
supporting docking, conforming to the System Tray Freedesktop standard.