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nomacs vs Gwenview: catalog facts
nomacs	Gwenview
Free Free and open source under the GPL 3.0.	Free Free and open source, part of the KDE applications.
Windows, macOS, Linux	Linux
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Quick browsing through folders of images Basic edits such as crop, resize and red-eye reduction
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Editing is limited to simple adjustments Best integrated with the KDE Plasma desktop
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.