slackbuilds/desktop/wmsystemtray

wmsystemtray (A system tray as a Window Maker dock app)

wmsystemtray is a system tray using the freedesktop.org system tray
protocol designed as a Window Maker dock app. It has the ability to
display more than one dock window to make room for more tray icons, 
and the ability to scroll through the icons if more are present than
will fit.