Productive Slack is a Chrome extension designed to enhance productivity by minimizing distractions within the Slack platform. It allows users to blacklist distracting channels, ensuring they can stay focused and in the flow. By restricting access to only whitelisted channels and private messages, Productive Slack prompts users with challenging questions when attempting to access other channels, encouraging them to reconsider the interruption to their workflow.

This free Chrome extension by Jeremy Nagel - Deluge on a Luge provides a practical solution for those seeking to optimize their Slack usage and maintain high levels of productivity by controlling their channel access effectively.