StatusOk (Open source) - Get notified through Slack/email when your website is down
Troops Slack Sales Gong - The most customizable Salesforce Gong in Slack
Better Uptime - We call you when your website goes down
Attentive - A marketing channel, built for retail & e‑commerce
Is it down by Freshping - Check if any website is down from 5 global locations
Get Notified - Get Notified when something happens