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GraphicsGale vs mtPaint: catalog facts
GraphicsGale	mtPaint
Free Freeware since June 2017.	Free Free and open source under the GPL-3.0.
Windows	Windows, Linux
Real-time animation preview while editing Onion skinning and layers for frame-by-frame work	Edits indexed palette and 24-bit RGB images Layers, channels and animation support
Windows only Closed source	Basic tools compared with full photo editors No release binaries published on the GitHub repository
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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