Slack has gone from the new hotness, to controversial productivity tool, to essential office tool faster than I can say “hot take.” With a familiar, instant messenger feel, it’s easy to get started with Slack. But the service became popular because of its wealth of advanced features, like customizable alerts and a Do Not Disturb function. I can even host VoIP calls through Slack with my coworkers. A free account will get me started, but a monthly fee unlocks even better search tools. And be sure to install the GIPHY plugin for maximum productivity.