Customer communication app for product marketers

We've been using Drift from day one when it was just Live Chat. The ability to chat with visitors to answer support questions or sales questions on your site right from Slack (using their Slack integration) is a game changer for us. Most of the other tools like Zendesk for support will notify you in Slack, but won't let you respond directly in Slack. It allows me to personally answer more than 50% of the questions asked in spite of having 89 other jobs.