StatusOk (Open source) - Get notified through Slack/email when your website is down
Product Makers - A Slack community to connect with other makers
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Lowdown - Lowdown unleashes the valuable content locked within Slack and emails it to your members so they don't miss key information.
Get Notified - Get Notified when something happens
Scrumbot - A summary of all team data in Slack before your daily scrum