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CactusViewernomacs
Free

Free and open source under the BSD 2-Clause licence; donations are welcome.

 Free

Free and open source under the GPL 3.0.

Windows Windows, macOS, Linux
  • Single executable with no installer needed
  • GPU rendering through a custom Direct3D 11 renderer
  • Opens RAW camera files and Photoshop PSD documents
  • Synchronises pan and zoom between two windows or two machines
  • Windows only
  • No packaged releases on the GitHub repository
  • Not an editor; adjustments are minimal
  • The interface exposes a lot of panels at once
Downloadable app Downloadable app
Open source Open source
License: BSD-2-Clause License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

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