Apps similar to SimplePDF include SumatraPDF, which is free and open source. Other options are Okular, IrfanView, XnView MP and ImageGlass. There's no shortage of Image Viewers like SimplePDF, with more than 50 alternatives for Windows, Linux, Mac, iPad and iPhone.
Phatch is an user friendly, cross-platform Photo Batch Processor and Exif Renamer with a nice graphical user interface. Phatch handles all popular image formats and can duplicate (sub)folder hierarchies.
Belgium
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sxiv is a simple image viewer for X. It only has the most basic features required for fast image viewing.
FastStone MaxView is a fast, compact and innovative image viewer that supports all major graphic formats. Its intuitive layout lets you view images in a variety of ways. It even lets you view images in password-protected ZIP and RAR archive files directly and instantly, which is...
Canada
Xreader is a document viewer capable of displaying multiple and single page document formats like PDF and Postscript.
GPicView is a simple and fast image viewer with low memory usage. This little program is not aimed to be powerful or feature-rich. Its aimed to replace the default image viewer of current desktop systems.
Taiwan
The Ristretto Image Viewer is an application that can be used to view, and scroll through images.
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A plugin that lets you view HEIC photos on Windows and convert them to JPG by right-clicking.
Switzerland
With 7GIF you have full control over the animation: play, pause, repeat, frame-by-frame view, zoom, speed up/down; and a LOT of features like: frames export, fast GIFs switching, slideshow, full screen mode, Windows 7 (8 and 10) advanced taskbar features, multilanguage UI...
By default, macOS doesn't provide previews and thumbnails for WebP, a modern image format providing superior, lossless and lossy compression for images on the web. WebPQuickLook fills this gap by allowing you to see previews and thumbnails of .webp images on your Mac.
This is a Free & Fast Image Viewer and Editor for Windows. There are many tools around doing that, but the aim of this Freeware is to be a small and handy tool doing what it says and running also as a standalone exe file (installer not necessary).
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Electro is a blazingly fast image viewer built with Rust, featuring an integrated terminal for enhanced productivity.
Madamiru is a cross-platform media player written in Rust that can automatically play and shuffle multiple videos, images, and songs at once in a grid layout.
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