Afterstep Clock: NeXT-like clock, completely rewritten for GTK and Gnome. Used on top of the GNOME panel.
GNOME Panel: The program that runs all those applets and has a nice menu for launching programs.
GProc: A gnome applet which allows you to manage your running processes with only a few mouse clicks.
The Rest: GQradio, Clockmail, Sound Monitor, Divider, Tick-A-Stat GNOME panel applets.