vEMan - [v]Mware [E]SX [Man]ager provides a GUI for managing ESX servers natively from within your Linux desktop without the need to use Windows vSphere® anymore!
Support vEMan development for v2.0 by gofundme!
http://www.gofundme.com/vEMan
Why I started vEMan? Because I hate it to start my Windows VM to manage ESX(i) servers ;o)
vEMan is (maybe) not needed if you use vCenter 5.x: http://kb.vmware.com/kb/2005377
--> vSphere >= v5 has a "web client"
BUT keep in mind that there are...
Xenue is a Xen kernel plus a linux domain0 environment, with web based tools to configure and manage your hardware and virtual machines. It boots from the flash area of pc or from usb thumb disk as the pre environment before any service os boots.