UptimeRobot - Free Website Uptime Monitoring
Absence - Employee vacation tracking system
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.
Sage HR - Sage HR is a one-stop shop for your HR management needs. Your HR - simplified!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Calamari - Calamari helps organizations, companies, and enterprises to manage their human resources in an easy and compliant way by delivering modern and easy-to-use time tracking and attendance management tools.