It would be great if there was a cross platform app for bringing your collections down to your local machine for slicing locally.
I envisage a small electron app which allows you to select a directory on your PC where you can bring down and unzip the collections you have on the website and use them inside your favourite slicer.
My favourite slicer is Cura because it has a Thingibrowser addin, and something like that which is compatible with other slicers or standalone would be a massive win!
On another front, those with homelabs might benefit from a dockerised app which can help to manage their collections locally on their NAS or homelab servers.