FastStone Image Viewer might be a bit more popular than Pix. We know about 1 link to it since March 2021 and only 1 link to Pix. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I use Pix that comes stock with Linux Mint. It has a couple of different viewing modes, the one I think you want is file tree on the left and thumbnails on the main screen, you can drag and drop into folders. If you double click an image it goes to thumbnails on the left with the main part being the image. Source: about 1 year ago
And also this " faststone.org" that gives me this error:. Source: almost 2 years ago
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