Taskwarrior is an open-source, cross platform time and task management tool. It has a command-line interface rather than a graphical user interface.Taskwarrior uses concepts and techniques described in Getting Things Done by David Allen, but is paradigm-agnostic in that it does not require users to adhere to any given life-management philosophy.According to its author, Taskwarrior was created "to address layout and feature issues" in the Todo.txt applications popularized by Gina Trapani.