Review of GPicView powered by the Slant community.
A Simple and Fast Image Viewer for X. Part of the LXDE project.
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Pros
Pro Multiple windows
When opening multiple images at once it opens every single picture in a separate window.
Pro Functional
It has all the necessary functions that you can reasonably expect from a lightweight image viewer: you can view all the image files in a directory, rotate and save them.
Pro Customizable
Pro Extremely lightweight
And still you can browse all images in a directory.