Who doesn't like a good morning read on Hacker News with a warm coffee?!
An extensive walk-through on how to build such an extension can be found on the developers docs.
Spotify Player
Spotify's most common features, now at your fingertips. Search for music and podcasts, browse your library, and control the playback. Glance at what's currently playing directly from the menu bar.
Apple Notes
Search and create notes within the Apple Notes application.
System Monitor
Show information and usage related to CPU, memory, power and network
Get product updates and news in your inbox. No spam.