Proxmox is also making their own: https://www.proxmox.com/en/products/proxmox-datacenter-manager/overview
source code: https://github.com/proxmox/proxmox-datacenter-manager
Two more that I have found:
Proxmox is also making their own: https://www.proxmox.com/en/products/proxmox-datacenter-manager/overview
source code: https://github.com/proxmox/proxmox-datacenter-manager
Two more that I have found: