SolarWinds VM Monitor is an ingenious desktop tool that continuously monitors a VMware ESX server and its virtual machines, delivering the real-time monitoring of ESX that you've been missing. With VM Monitor at your fingertips, you'll be able to track virtual server health at-a-glance and ensure your mission-critical apps never fail you... after all, VM Monitor ensures you are visually alerted in real time to any issues in your virtual reality.
Freeware
http://www.solarwinds.com/products/freetools/vm_monitor.aspx
