There are planty of opensource software that can be used for managing vmware or other virtualization through web. some of them are commercial or personal.
here is link to site that provide few of them. look for one that include vmware as supported platform.
http://www.linux-kvm.org/page/Management_Tools
I used openQRM and CloudStack and OpenNode and they are good .
PS : As i know for using vsphere web client you sould have a cCenter that joined to an Active Directory. i did'nt find a way to dont install active directory and and just the vcenter in workgroup. i always get error when i try to install SSO and vCenter inventory and vCenter.
Armin Lavaee
Go Virtual
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