Things - Things is an easy to use task manager.
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Motion Firefox - All-in-one time management tool in Firefox
Add-to-Calendar Button Generator - This open source projects lets everybody create amazing buttons, where users can add events to their calendars.
Taskable - Using multiple work apps leads to tons of context switching, breaking flow and killing productivity.
Plan - Plan is a better way to organize.