wmsystray provides a system tray compatible with
freedesktop.org's System Tray Protocol
specification. Basically, it serves as a system
tray that allows other programs to show icons in
it. For example, if you enable GAIM's System Tray
Icon plugin, wmsystray will display GAIM's systray
icon. Its intended use is as a Window Maker dock
app, though it will run in other window managers
as well.