Troops Slack Sales Gong - The most customizable Salesforce Gong in Slack
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Attentive - A marketing channel, built for retail & e‑commerce
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
StatusOk (Open source) - Get notified through Slack/email when your website is down
Better Uptime - We call you when your website goes down