Avant Window Navigator is a dock / task manager for Linux founded by Neil J. Patel, who was later hired by Canonical to work on Unity.
A quick update for AWN fans: after several years of inactivity, Avant Window Navigator is maintained again thanks to Povilas Kanapickas, who took over the project recently.
The code was moved to GitHub and there are some bugs and broken plugins which Povilas Kanapickas is trying to fix, but the core functionality is usable.
New AWN GitHub repositories:
Unfortunately, AWN continues to depend on valac-0.12 which is obsolete, meaning that AWN won't make it in the official Ubuntu / Debian repositories unless it's ported to a newer valac version. However, you can install it in Ubuntu 13.10 by using the AWN Testing PPA (for Ubuntu 13.04 or 12.10 you can use the main WebUpd8 PPA; AWN is available in the official Ubuntu 12.04 repositories).
Install Avant Window Navigator in Ubuntu
To add the AWN testing PPA and install Avant Window Navigator in Ubuntu 13.10, use the following commands:
sudo add-apt-repository ppa:awn-testing/ppa sudo apt-get update sudo apt-get install --install-recommends avant-window-navigator
Update: for Ubuntu 14.04 and 16.04, see THIS article.
Thanks to Povilas Kanapickas for the info!