Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
ATracker - ATracker app allows you to track your time in a few simple steps and can view full daily, weekly, and monthly reports at a glance.
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
myPoli - Gameified to-do list and habit tracker.
Calendarist - Time blocking companion for Google Calendar
iBetter - iBetter app comes up with features to help you in fighting bad habits and developing new habits through your smartphones.