Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.

Flow - Stop managing projects from your inbox.

The New Dropbox - Enterprise software portal for team collaboration

Planndu - Planndu is a simple task manager app for individuals that helps you to improve productivity and stay focused. It has features to set reminders, status, priorities, and focus techniques to improve concentration and get more of your day.

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.

Fresboard - Notes, tasks & chat - Unified workspaces for projects