PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms. It lets you run a remote session from a Windows PC to a Unix computer, over a network, so you can work on the Unix machine as if you were sitting at its console.
TeamViewer is a well established app and an intuitive way to remotely control computers, tablets, and smartphones. It is free for personal use available for all major platforms.
The popular open source virtual machine hypervisor VirtualBox is getting a new major release that adds VM exports to Oracle Cloud (OPC) and unattended guest installation. Version 5.2 is now available for all platforms.