xscreensaver

Install command: 
brew install --cask xscreensaver

Name: XScreenSaver

Screen savers

https://www.jwz.org/xscreensaver/

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

Cask code: xscreensaver.rb on GitHub

Current version: 6.10

Requirements: macOS >= 10.11

Analytics:

Installs (30 days)
xscreensaver 44
Installs (90 days)
xscreensaver 128
Installs (365 days)
xscreensaver 446