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The latest development in IT Services Management tools may well be the release of Zenoss Core 4 (see this Press Release).
Zenoss is a component-level IT monitoring tool with two versions: Zenoss Core, a free and Open Source product, and the commercial version, Zenoss Enterprise, which is sold by Zenoss Inc., the corporate sponsor of Zenoss Core. Large distributed IT departments will probably consider Zenoss Enterprise as it extends the Core with multiple collectors. As always, all components of the Zenoss 4 architecture are built from Open Source tools.