Nudge (macadmin's Slack #nudge)
Nudge is an multi-linguistic application, offering custom user deferrals, which strongly encourages macOS updates. Written in Swift and SwiftUI.
Nudge will only work on macOS Big Sur 11 and later and is a replacement for the original Nudge, which was written in Python 2/3. If you need to enforce macOS updates for earlier versions, it is recommend to use nudge-python.
For more information about installation, deployment and the user experience, please see the wiki