Azendoo Calendar - Todos meet calendar to manage your team deadlines

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.

Teamwork - The Project Management App for Professionals. The most powerful and simple way to collaborate with your team.

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.

Slack - A messaging app for teams who see through the Earth!

Basecamp - A simple and elegant project management system.