Later Reminders - Super simple way to schedule reminders on your phone
vim-taskwarrior - a vim interface for taskwarrior
Reminder - A better way to keep track of your reminders 📝
Calcurse - Calcurse is a calendar and scheduling application for the command line.
Tiny Reminder - Collect content & files from busy clients
Toodledo - Toodledo provides a set of tools to increase the productivity.