Is there a simple GUI available for running LLaMA on my desktop that I can access from my laptop?

If you are on a Mac, give https://recurse.chat/ a try. As simple as download the model and start chatting. Just added the new multimodal support in LLaMA.cpp.

Give https://docs.openwebui.com/ a look, you'll be able to access it by using your desktops IP while on your laptop (providing you're on the same network).

isnt that ollama + any client supporting it?

using tailscale for the internal network works really well