Slack - A messaging app for teams who see through the Earth!
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.
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Ripcord - A desktop chat client for Discord and Slack
Better Uptime - We call you when your website goes down