Most of the sites I’ve seen are indeed just demos. I especially like Compute Toys [0], a Shadertoy clone for WebGPU. [1] is probably the best place to find demos. I have a site myself in which I experiment mainly with WebGPU Compute Shaders [2].

[0] https://compute.toys/

[1] https://github.com/mikbry/awesome-webgpu

[2] https://github.com/s-macke/WebGPU-Lab