

VNC? You have your choice of servers, and clients are ubiquitous.
A big gotcha is that you need to be careful with encryption/security, as in classic UNIX style VNC does one thing (remote desktops). It’s easy to forward over ssh though.
You can also use VNC to share, which is not what you want; this depends on the type of server/settings. But you can definitely create a new virtual X11 session and access it remotely.





Torvalds uses it too I believe, so you’re in good company (Debian for me, though my heart belongs to Slackware).