Absence - Employee vacation tracking system
UptimeRobot - Free Website Uptime Monitoring
Appogee Leave - PARIM Workforce Management Software
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.
CWS TimeOut - CWS TimeOut is an online leave tracking software or absence management solution that can also be installed on the server.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring