Nomacs is a free, open source image viewer, which supports multiple platforms. Developed by Markus Diem, Stefan Fiel and Florian Kleber
License: Open Source
PhotoQt is a lightweight and customizable image viewer focused on speed and basic organization, while Nomacs offers more advanced editing features and extensive organizational tools. Users seeking a simple, fast viewer may prefer PhotoQt, whereas those needing robust editing and batch processing capabilities will find Nomacs more suitable.