vCenter Server Licensing Options - VMware vSphere Blog
A quick look at VMware vSphere Editions and Licensing
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VMware vSphere Essentials Kit and Essentials Plus Kit Datasheet
Free ESXi 6.0 - How to Download and get License Keys | virten.net
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VMware ESXi and vCenter licensing in VMware vSphere
VMware vSphere Essentials Kit ( v. 6 ) - subscription license ( 1 year ) This is Essential Support to be Purchased with tem #: 32-331-029|Mfr. Part #: VS6-ESSL-KIT-C - Newegg.com
Academic VMware vSphere 6 Essentials Kit for 3 hosts (Max 2 processors per host)
vSphere 6.5 - How to Assign License Key to vCenter Server - VMWare Insight
vSphere 6.5 - How to Assign License Key to vCenter Server - VMWare Insight