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CactusViewer vs Oculante: catalog facts
CactusViewer	Oculante
Free Free and open source under the BSD 2-Clause licence; donations are welcome.	Free Free open-source software.
Windows	Windows, macOS, Linux
Single executable with no installer needed GPU rendering through a custom Direct3D 11 renderer	Fast viewer built in Rust Wide image format support
Windows only No packaged releases on the GitHub repository	Project is in maintenance mode Editing features are basic
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause	License not stated
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 September 23, 2026

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