TargetProcess - Agile Project Management Web Application
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Taiga - Project management platform for agile developers & designers
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.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
Dropbox Paper Mobile - Organize your team’s knowledge in a single place