Things - Things is an easy to use task manager.
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
Motion Firefox - All-in-one time management tool in Firefox
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Taskable - Using multiple work apps leads to tons of context switching, breaking flow and killing productivity.
Add to Calendar Link Generator - Create buttons for Google Calendar, Office 365 and Apple Cal