There are 2 repositories under nested-virtualization topic.
kHypervisor is a lightweight bluepill-like nested VMM for Windows, it provides and emulating a basic function of Intel VT-x
Docs for the preview of the Android machine image on CircleCI
📦 Debian Vagrant box with Vagrant and VirtualBox for nested virtualization
Ansible to enable or disable nested virtualization
An Ansible role that enables nested virtualization on a Proxmox host.