What does HackerNews think of wayvnc?

No - it's not X, it's doesn't share a screen in the way X does.

That said... if this is a shoddy attempt at a "gotcha" style question - Screen sharing and remote desktop are both supported.

Ex - for Gnome:

https://wiki.gnome.org/Projects/Mutter/RemoteDesktop

LibVNCServer for VNC support, FreeRDP for remote desktop protocol.

For KDE:

https://userbase.kde.org/Krfb

Which mostly just works as long as you have Pipewire and xdg-desktop-portal-kde installed (the base plasma-wayland session usually includes them)

This one is a bit less polished - some users still have problems with keyboard input, depending on the distro and other installed packages.

For Sway:

xdg-desktop-portal-wlr works just fine for screen sharing, and you can use https://github.com/any1/wayvnc for VNC access (including having a completely headless machine).

>does anyone know of similar software to create dummy displays on Linux?

Xvfb (https://linux.die.net/man/1/xvfb)

wayvnc: https://github.com/any1/wayvnc

Weston has a headless backend also.

TeamViewer/AnyDesk/VNC is not "remote windowing", it's "remote access" to a whole desktop. And that's easily available for the wlroots ecosystem https://github.com/any1/wayvnc

But actually "remote windowing/apps" is even better supported, it's a universal proxy: https://gitlab.freedesktop.org/mstoeckl/waypipe Absolutely does not require any support from the core protocol.

"Wayland forwarding": https://gitlab.freedesktop.org/mstoeckl/waypipe

VNC: https://github.com/any1/wayvnc

I haven't tried it, but there's also this one for wlroots-based compositors (eg. sway): https://github.com/any1/wayvnc

Options for Wayland are a bit less antiquated. Here’s a couple.

If you are ever using a wlroots based Wayland compositor, then wayvnc becomes an option for RDP. (Note: haven’t personally used this.)

https://github.com/any1/wayvnc

Waypipe offers network transparency to Wayland, where by you can run applications across the network. I believe this should work with roughly any compositor.

https://gitlab.freedesktop.org/mstoeckl/waypipe/