taskwarrior
This plugin adds smart tab completion for TaskWarrior.
It uses the zsh tab completion script (_task) shipped with TaskWarrior for the
completion definitions.
The latest version pulled in from the official project is of January 1st, 2015.
Examples
Typing task [TAB] will give you a list of commands, task 66[TAB] shows a
list of available modifications for that task, etcetera.