netnewswire

Install command: 
brew install --cask netnewswire

Name: NetNewsWire

Free and open-source RSS reader

https://netnewswire.com/

Cask JSON API: /api/cask/netnewswire.json

Cask code: netnewswire.rb on GitHub

Current version: 6.1.9

Current version requires: macOS >= 10.15

Conflicts with casks:

netnewswire@beta 6.1.9 Free and open-source RSS reader NetNewsWire

Versions:

Apple Silicon monterey 6.1.4
big sur 6.1.4
Intel monterey 6.1.4
big sur 6.1.4
catalina 6.1.4

Analytics:

Installs (30 days)
netnewswire 393
Installs (90 days)
netnewswire 1,206
Installs (365 days)
netnewswire 4,615
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