PhotoQt is a simple, yet powerful and good looking image viewer, written in C++/Qt, published as open-source, and completely free. Developed by Lukas Spies
License: Open Source
PhotoQt is a lightweight, multi-platform image viewer that excels in speed and format support, making it ideal for quick viewing and basic management. In contrast, IrfanView is a more feature-rich application primarily for Windows, offering extensive editing and batch processing capabilities, suitable for users who require advanced functionalities.