File manager / browser - for 3D models
It probably doesn't exist, but it would be useful. There are many file manager/browsers for images, a similar one or repurposed one for 3D models would be nice. It would let you more easily browse and sort your 3D models. One 3D model can have many .STL objects, and you can store them with some images of the final product along with text document documentation meaning you store many models in folders and subfolders, which is very tedious process to navigate. I guess you can automate to make shortcuts and collect them in one folder to all images present in these folders to get one place to preview 3D models by images, or similar solutions, but this is still not that great.
Below image is suggestion for a browser (maybe a project for open source? repurposed open source image browser if they exist?):