Yes, there are few way to convert a virtual appliance to ESXi. Here is quick steps
1. Install “VMware vCenter Converter Standalone”. It’s free
2. From “VMware vCenter Converter”, choose “Convert Machine”
3. Select source type “VMware Workstation or other VMware virtual machine”
4. Put proper virtual machine file; in this case “zenoss-3.1.0-1031-x86_64.vmx”
5. Select destination type “VMware Infrastructure virtual machine” and enter VM server details
6. In this case, already disck size and virtual machine version is set from when it was created
7. Verifying destination parameters…..
8. Option; Reviewing options. You don’t want to change any option here.
9. Click “Finish”
10. Progress
11. Done
12. Power on Virtural machine and check IP. Change it if needed.
13. http://x.x.x.x:8080 ; Now you got Zenoss Virtural Machine on your ESXi