I use my current phone to monitor many remote systems, and do so through SSH, VNC, and VPNs.
I assume SSH and VPNs would not be difficult to support, but do we know if any kind of VNC viewer has been mentioned or if there have been any details about including it?
I havn‘t seen anything on this. As usual any app in the debian free repos with arm64 suport will run on the librem5 but with probanly bad usabity for small screens. Best bet is to find a good existing gtk3 app as these seam to be the easiest to port with the new libhandy widget.
GNOME Boxes supposedly allows for VNC connections, though I haven’t tested it. I don’t use VNC sessions much in my current work, but previously when needing VNC connections, I used Vinagre.