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gThumb vs Fotocx: catalog facts
gThumb	Fotocx
Free Free and open source under the GPL version 2 or later.	Free Free and open source under the GPL version 3.
Linux	Linux
Native GNOME desktop application Works on local folders without a server	Editor and collection manager in one program No tracking or advertisements
Linux only No cloud sync or phone backup	Linux only Small, single-developer project
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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