There are 2 repositories under openvr-overlay topic.
A simple OpenVR overlay for Wayland and X11 desktops
Access your Wayland/X11 desktop from Monado/WiVRn/SteamVR. Now with Vulkan!
An anti-cable-twisting management utility for SteamVR.
NZQA: Use advanced programming techniques to develop a computer program (91896)