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nomacs vs Ristretto: catalog facts
nomacs	Ristretto
Free Free and open source under the GPL 3.0.	Free Free and open source under the GPL v2.0 or later.
Windows, macOS, Linux	Linux
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Lightweight and quick to open images Integrates with the Xfce desktop
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Linux only Viewing only, with no editing or library 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 September 24, 2026

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