If you want a copy of the source you can get it via the Open Source tab on most VMware products download page. You'll find the open source distributed for ESXi

If you want a copy of the source you can get it via the Open Source tab on most VMware products download page. You'll find the open source distributed for ESXi under the VMware vSphere Open Source group on this page -> https://my.vmware.com/web/vmware/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/5_5#open_source https://my.vmware.com/web/vmware/info/slug/datacenter_cloud_... It doesn't require a snail mail letter as far as I can tell.