Sortd - Rated the #1 App for Gmail
KosmoTime - The to do list with super powers
KanbanMail - A Kanban board for your emails.
Cron - Cron Calendar.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.