Tools/OpenStack
OpenStack
Full open-source private-cloud platform — compute (Nova), virtual networking (Neutron), block/object storage, and more, giving AWS-like APIs on self-managed hardware. The closest open-source alternative to AWS_Outposts (extending cloud-style infra on-prem) and to Amazon_VPC specifically via its Neutron networking component; Proxmox VE is the common lighter-weight alternative when full OpenStack's complexity isn't needed.