Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
The New Dropbox - Enterprise software portal for team collaboration
P2 - Share, discuss, and collab with your team. By Wordpress.
Wait.chat - Deadline-aware message inbox for async teams
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.