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.

15Five Plus - Insights to manage, measure, and retain great employees.

KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.

Teambit - Teambit is a team engagement and performance platform, that makes feedback a daily habit.

Meistertask - MeisterTask is an intuitive task management and collaboration tool.

HappyTeam - The simplest way to keep a pulse on your team's mental health and well-being.