ADeskBar is described as 'a lightweight application launcher for Openbox, written in Python and GTK'. There are seven alternatives to ADeskBar for Linux, BSD and Xfce. The best alternative is Cairo-Dock, which is both free and Open Source. Other great apps like ADeskBar are tint2 (Free, Open Source), Avant Window Navigator (Free Personal, Open Source), PyPanel (Free, Open Source) and GnomePanel (Free, Open Source).
Avant Window Navigator (AWN/Awn) is a dock-like navigation bar for the linux desktop that positions itself at the bottom of the screen. It can be used to keep track of open windows and behaves like a normal window list.
PyPanel is a lightweight panel/taskbar written in Python and C for X11 window managers. It can be easily customized to match any desktop theme or taste. PyPanel works with EWMH compliant WMs (Openbox, PekWM, FVWM, etc.) and is distributed under the GNU General Public License v2.
Dzen is a general purpose messaging, notification and menuing program for X11. It was designed to be scriptable in any language and integrate well with window managers like dwm, wmii and xmonad though it will work with any window manager.
BMPanel (bitmap panel) is a lightweight, NETWM compliant panel for X11 Window System, which contains a desktop switcher, taskbar, system tray and clock. The application is inspired by simplicity of fspanel. BMPanel has a modern look and feel, while keeping itself tiny and small.