Precursor - Precursor helps designers and developers communicate and collaborate in real time.

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.

mi.team - Collaboration app with chat, task board & video conference

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Justinmind - Define awesome experiences through wireframes & prototypes.

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.