Voted for Actifit (https://actifit.io/).

In my humble opinion, Actifit is very special. Apart from the fact that the project helps to motivate people to keep moving and staying more fit, the management of the project has been awesome. If I'm to vote over and over again, I will still choose Actifit. With all sincerity, it has been the best so far. That's just the right choice.