Lightning Calendar - Organize your life — it’s about time!
Taskbook - Like Trello but for the Terminal
Google Calendar - Spend less time managing your day & more time enjoying it
Taskwarrior - Taskwarrior is an ambitious project bringing sophisticated capabilities to a simple and elegant...
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Calcurse - Calcurse is a calendar and scheduling application for the command line.