• fbpanel - I use this with the "genmon" plugin which allows me to have arbitrary text in the bar. I put a nice clock in there.
• LXPanel - Forked from fbpanel, but it's missing hotkeys when right-clicking a taskbar item. Has a nice gui configuration tool. My favourite.
• tint2 - A new project. Has no menu and is otherwise very configurable and light.
  • It doesn't show a tray for me, but since it's showing some tray icons in the screenshots I presume I need to configure things differently.

Library usage: ldd /usr/bin/tint2|wc -l

• tint2 28
• lxpanel 38
• fbpanel 45

COMMAND SZ RSS VSZ tint2 2468 6580 11728 lxpanel 3184 10560 31564 fbpanel 3128 10600 32160

tint2 has no menu functionality. It might be possible to further-slim down any of these by disabling features or configuring them differently.