Unreal Showcases are fully functional sample apps that demonstrate technical concepts and multiple features in action as self-contained experiences. They are stored and maintained on GitHub and can be great starting points to dive deep into Meta Quest development.
List of Unreal showcases
Unreal Graphics
This showcase demonstrates how to use Vulkan subpasses to implement performant tonemapping for color grading LUTs, day-night cycle, fade in / fade out, and vignette effects.
This is a multiplayer showcase that demonstrates basic multiplayer functionality in Unreal, including Platform Social APIs, Photon as the transport layer, and UE replication.