Plan - Plan is a better way to organize.
Sortd - Rated the #1 App for Gmail
Outplanr - Turn your to-do list into a real work plan
KanbanMail - A Kanban board for your emails.
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app
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.