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 image viewer with a focus on speed and customization, offering support for many image formats and features like slideshows. Viewnior, on the other hand, emphasizes a simple, clean interface and fast loading times, making it ideal for basic image viewing but lacking advanced features.