Automated systems monitoring is critical to organizations of all sizes to ensure reliable and secure IT operations. Until now, however, powerful monitoring tools were within reach for only the largest organizations because of their astronomical cost and complexity. Zenoss is a GPL licensed enterprise grade monitoring system that provides Inventory/Configuration, Event, Performance and Availability management in a single integrated package. It is written in Python using the Zope web application framework and Twisted network programming environment.-Zenoss is designed to be easy to use for a beginner yet flexible and powerful enough for the advanced user. If you are struggling to keep up with your growing IT infrastructure - or you are frustrated with your current monitoring software - Zenoss offers you a compelling new alternative.