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nomacs vs pwall: catalog facts
nomacs	pwall
Free Free and open source under the GPL 3.0.	Free Free and open source under the GPL 2.0 or later.
Windows, macOS, Linux	Linux
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Folder tree next to a fast thumbnail wall Handles both photos and videos
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Small project with limited documentation No editing features
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later
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 October 1, 2026

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