UXPin + Slack - Keep tabs on design projects in Slack
StatusOk (Open source) - Get notified through Slack/email when your website is down
Attentive - A marketing channel, built for retail & e‑commerce
Better Uptime - We call you when your website goes down
Get Notified - Get Notified when something happens
Is it down by Freshping - Check if any website is down from 5 global locations