Xangati for ESX

Xangati for ESX is a free tool that monitors a single ESX or ESXi host.  The solution offers:

Auto discovery and naming of ESX/ESXi’s VMs and applications

Continuous, real-time visibility into over 100 metrics on an ESX/ESXi host and its VMs activity, including communications, CPU, memory, disk, and storage latency

DVR recording and replaying of activity with scroll-bar

Visibility into vSwitch communications

12 weeks of historical reporting on named identities

http://xangati.com/products/xangati-for-esx/