vsd-viewer

Install command: 
brew install --cask vsd-viewer

Name: Nektony VSD Viewer

Preview .VSD, .VDX, .VSDX file formats of Visio drawings

https://nektony.com/free-visio-viewer-mac

Cask JSON API: /api/cask/vsd-viewer.json

Cask code: vsd-viewer.rb on GitHub

Current version: 6.16.1,563

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
vsd-viewer 22
Installs (90 days)
vsd-viewer 48
Installs (365 days)
vsd-viewer 133