01 Slack
What began as a messaging tool for video game developers has evolved into the full-service collaboration platform we now call Slack. It is an easy-to-use messaging service and integrates with popular services such as Twitter and Dropbox. Conversations or channels are organised by topic of which you can have as many as you like. The design is slick and simple, and you can share any file type (including photos and videos) with colleagues in a fraction of the time it would take to email them. (Interestingly, teams who use Slack claim to see an average 48.6 per cent reduction in internal email). It also has video call functionality for up to 15 participants, for those days when you need to see your fellow workers’ faces.