Slack is the best inbox organizational tool in the market now. It is used by many huge companies ranging to average-sized and small companies as well. You can make and manage the business conversations through this app and can keep a record of them too.
Slack was initially released in August 2013, when there was not its single competitor out there in the market. Yes, there were many other messaging platforms but not for the business. Usually, the business websites give a boring idea of faded colors and take all the charm and drive away to use that website or app. But Slack did something different.