Vester
Vester is a community project that aims to provide an extremely light-weight approach to vSphere configuration management using Pester and PowerCLI. The end-state configuration for each vSphere component, such as clusters and hosts, are abstracted into a simple config file. The configuration is tested--and optionally remediated--when drift is identified. The entire project is written in PowerShell.
March 2017: To learn how to use Vester 1.0, there is a three-part blog series and accompanying video demo. (Which is really long. You've been warned.)
The below documentation link is outdated. We'll remove this comment when we've finished refreshing that info.
Please visit the full documentation for more details.