As part of our own initiatives we use open-source software.
Such systems based on open-source model are BOINC, and Elastic Stack.
We use advanced virtualization technologies and LXC containers based on Proxmox Virtual Environment.
Following the information on Wikipedia:
Proxmox Virtual Environment is an open-source server virtualization management platform. It is a Debian-based Linux distribution with a modified Ubuntu LTS kernel and allows deployment and management of virtual machines and containers. Proxmox VE includes a web console and command-line tools, and provides a REST API for third-party tools.
Open-source models built by communities in a huge way are very interesting.
We encourage you to support open-source initiatives and take advantage of such environments!