Incus is a virtual machine platform, similar to Proxmox, but with some big upsides, like being packaged on Debian and Ubuntu as well, and more features.

https://github.com/lxc/incus

Incus was forked from LXD after Canonical implemented a Contributor License Agreement, allowing them to distribute LXD as proprietary software.

This youtuber, Zabbly, is the primary developer of Incus, and they livestream lots of their work on youtube.