I've been using a free Slack account for a couple of months now. I think it's great and I want to share it with you. Not only is it effective for working teams but for friends, too. Those who are willing to stick with it at least. The increase in productivity and transparency that they boast on their front page are true for me and my team. You can check out more of their survey results here.
So what is Slack and what is it trying to solve? You can watch the video below for a better explanation but in one sentence, Slack to me is a wonderful team messaging tool with a lot of neat features to improve productivity and collaboration. More details after the video link.