Last week I wrote about some VKernel whitepapers useful in the design of a virtual infrastructure. But there also some interesting and free tools: vScope Explorer: enterprise-wide visualization of performance, capacity and resource efficiency health across multiple vCenters and resources. Capacity Modeler: allows you to easily assess the performance impact of capacity changes to your existing virtualized environment. CapacityVIEW: it quickly exposes The number of VMs with performance problems Available capacity The amount of over allocated CPU, memory and storage The total amount of resources in your environment Number of powered on and off VMs