VPS comes with a pre-installed operative system. The most popular operating Linux OS are Ubuntu 18.04 LTS (free), CentOS 8 (free) and Debian 10 (free). For a list of all available operating systems, see the order form.
The most popular Windows OS are Windows 2019 and Windows 2016. For a list of all available operating systems, see the order form.
You can opt for VPS with or without a Plesk control panel. The control panel lets you administer domains, web pages, databases, e-mail and more. The Plesk control panel comes with a free Spam Assassin spam filter.