Push It - Simple location aware messaging
Taskbook - Like Trello but for the Terminal
Toodledo - Toodledo provides a set of tools to increase the productivity.
Taskwarrior - Taskwarrior is an ambitious project bringing sophisticated capabilities to a simple and elegant...
Later Reminders - Super simple way to schedule reminders on your phone
Calcurse - Calcurse is a calendar and scheduling application for the command line.