Since launch, the most common first project hasn't been what I expected. I assumed smart home sensors. It's 3D printers.
The pattern: an ESP32 wired to the printer, one HTTP POST when the print finishes, a notification on the phone at 2am. Total firmware footprint is about a dozen lines, and the sketch is in our public examples repo.
A few other builds that came through the delivery logs and community submissions:
A garage door that complains after ten minutes open. A mailbox with a magnetic contact switch that pings when real mail arrives.
NotifyBridge
NotifyBridge