Alternatives to PhotoQt

IrfanView is a commercial image viewer and editor that can be used to orginize and convert images for Microsoft Windows. The application can handle video and audio files, while providing basic image editing capabilities. IrfanView is free for non-commercial use, while commercial use requires payment.

The classic Eye of GNOME is the official and default image viewer for the free and open source desktop environment GNOME. The application comes bundled with GNOME and is in later releases known as Image Viewer. However, Eye of GNOME can be used in any Linux operating system or distribution. It also share many similarities with another official image viewer for GNOME called gThumb

Xee³ Image Viewer is an streamlined and convenient image browser that allow you to manage your photos and rediscover old memmories. Xee³ Image Viewer share many similarities with macOS very own Preview app, the simplicity of the application makes it easy to browse the entire contents of folders and archives, move and copy image files quickly. The application supports most of the image formats commonly used today.

A versatile and powerful photo viewer, image management, image resize developed by XnSoft. The XnView MP image viewer is a free software for macOS, Linux and Windows. The software consist of a photo viewer and a photo editor. With the photo viewer you can view browse photos in thumbnail, fullscreen and filmstrip view and compare images and manage EXIF, IPTC, XMP meta data. The photo editor can be used to resize, rotate and crop photos or adjust brightness, contrast and color while applying filters and effects to images. 

Apple Photos is an app native to the macOS and iOS eco system. The application comes pre-installed with all Macintosh computers, iPhones and iPads. With Apple Photos you can manage, store and browse all your photos in a neat application.

Back up unlimited photos and videos for free, up to 16MP and 1080p HD with Google Photos. The application and service is provided by Google and works on your phone, tablet or computer.

iPhoto is an image library application built Apple, specifically for macOS and iOS. With it, you can keep your photos organized and accessible on your personal device or in the cloud, with iCloud. iPhoto allow you to rediscover favorite shots and old memories.

Windows Photo Viewer is an image viewer developed by Microsoft that was included with the Windows NT family of operating systems. Windows Photo Viewer was first iintroduced with Windows XP and Windows Server 2003 under its former name. It was temporarily replaced with Windows Photo Gallery in Windows Vista, but was resurfaced in Windows 7.

FastStone Image Viewer is a free image browser, converter and editor that supports common graphic formats such as BMP, JPEG, JPEG 2000, GIF, PNG, PCX, TIFF, WMF, ICO, TGA and raw files. FastStone Image Viewer is available for Microsoft Windows.