If you have ever been in need of an easy self-service portal for Proxmox to provide access to developers, or for selling resources, I found a solution that just might fit the bill. PVE Panel is a self-hosted solution that provides a self-service portal for Proxmox where you can define customers and assign specific resources to those customers using the workflows the solution provides. I found it easy to setup and easy to start providing resources. Check it out.