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.

HappyMeter - A frictionless way to measure happiness and job satisfaction

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

WorkStyle - Build a more effective and happier team in less time 🔨😍👍

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

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