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LightZone vs A Photo Tool (Libre): catalog facts
LightZone	A Photo Tool (Libre)
Free Free and open source under the BSD-3-Clause licence.	Free Free to download and use under the GPLv3.
Windows, macOS, Linux	Linux
Processes camera RAW files Runs on Windows, macOS and Linux	Straightforward exposure and color adjustments Custom black-and-white conversion
Smaller community than better-known RAW developers Documentation lives mainly in the repository	Limited file format support beyond JPEG No layers or advanced retouching
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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