Apache HertzBeat(incubating) is a real-time monitoring system
A Java based fault and performance management system
Enterprise-class, distributed monitoring solution for networks & apps
Standalone web application allowing to monitor end points availability
Monitoring of websites with spider and email notifications
Web based management tool for unixes
Integrated to system status data based on the HDFS
The Energy Sensing and Monitoring Infrastructure of the GAMES project
Small portlet for websites checking.