Squirrel
An macOS agent-based menu bar application, created only using the Swift Package Manager.
The application is a simple tracker. The app shows a count, and we can increas and decrease the count from our toolbar.
Here is the link to a post about it: https://rderik.com/blog/understanding-a-few-concepts-of-macos-applications-by-building-an-agent-based-menu-bar-app/