One of the most popular alternatives to nomacs is IrfanView, which is free for personal use. Other popular alternatives are XnView MP, ImageGlass, FastStone Image Viewer and qView. Image Viewers like nomacs are a crowded field, with more than 100 alternatives for Windows, Linux, Mac, Android and iPhone.
gThumb is an image viewer and browser for the GNOME Desktop. It also includes an importer tool for transferring photos from cameras.
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Native macOS app for viewing, annotating, and editing images and PDFs, featuring tools for cropping, rotating, resizing images, rearranging pages, full-screen viewing, markup, document merging, batch conversion, and export in multiple formats.
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PhoXoSee is a blazing fast and lightweight image viewer, Highly optimized at only 3.8MB in size, it brings you ultra-fast loading speeds and minimal memory usage. It features powerful real-time image processing that enhances your viewing experience.
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Desktop app for photo sorting on Windows & Mac, managing JPG+RAW files. Sort photos into folders using keys, providing easy navigation and clean interface without deletion, ensuring a focused experience with flexible viewing, safe storage, and no fluff.
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Organize, edit, and share your photography and digital media with ease.
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You can use the Photos app to view or edit photos and videos in your Pictures library and on OneDrive, and to import photos and videos. The Photos app includes a wide range of editing options to enhance your photos, from automatic fixes to advanced adjustments.
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An image viewer and browser utility - primarily for Linux Mint. Pix is part of the X-Apps project, which aims at producing cross-distribution and cross-desktop software.
Lathe is a fast, privacy-first media manager for macOS. Browse, organize, and batch-process your photos, videos, and PDFs, entirely on your Mac.
Fly Photos is one of the fastest photo viewers built for Windows, designed as a modern replacement for the now-discontinued Google Picasa Photo Viewer.
Eye of GNOME is the official image viewer for the GNOME Desktop environment. With it, you can view single image files, as well as large image collections. The Eye of GNOME supports a variety of image file formats.
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A fast, secure, and minimalist C++ image viewer for Windows. It's a single ~82 KB executable with zero telemetry and broad image support.
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