Sortd - Rated the #1 App for Gmail
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
KanbanMail - A Kanban board for your emails.
Flow - Stop managing projects from your inbox.
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.
teamcheck - Daily planner for creative teams