RocketDock is a Mac OS X dock clone. It provides a nice clean interface to drop shortcuts on for easy access and organization. With each item completely customizable there is no end to what you can add and launch from the dock.Discontinued
The program is no longer updated, but last version, 1.3.5, released in September 2008, can be still downloaded from the official website. "It is true, RocketDock has been discontinued. [...] The app remains available on https://rocketdock.com, but is unsupported."
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.
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
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.
ObjectDock is an animated dock for Windows that enables you to quickly access and launch your favorite applications, files and shortcuts.Discontinued
The program is no longer updated. Last version, 2.20, released in 2016, can be still bought from the official website
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.