Docky is a full fledged dock application that makes opening common applications and managing windows easier and quicker. Docky is fully integrated into the GNOME Desktop and features a no non-sense approach to configuration and usage. It just works.Discontinued
Last commit and last available version from 2015-09-02
Docky vs RocketDock opinions
Latte is a dock based on plasma frameworks that provides an elegant and intuitive experience for your tasks and plasmoids. It animates its contents by using parabolic zoom effect and trys to be there only when it is needed.
Plank is meant to be the simplest dock on the planet. The goal is to provide just what a dock needs and absolutely nothing more. It is, however, a library which can be extended to create other dock programs with more advanced features.
A dock for the Gnome Shell. This extension moves the dash out of the overview transforming it in a dock for an easier launching of applications and a faster switching between windows and workspaces.
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.Discontinued
Doesn't seem to be activaly maintained anymore. Last update was in 2017.
An icon taskbar for the GNOME Shell. This extension moves the dash into the GNOME main panel so that the application launchers and system tray are combined into a single panel, similar to that found in KDE Plasma and Windows 7+.This app doesn't have any features at the moment.
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.