Briefly, it’s a Raspberry Pi v1, Model B, Rev2 breakout with an STM32F030 microcontroller connected to the Pi UART, with all GPIOs for both broken out. There are also connectors for an NRF24L01+ module, a 12V boost module, and 315/433 Mhz wireless transmitters.
One board will serve as my Garage Door Controller, while the others will be used for general Pi hacking.
This was my first board manufactured at DirtyPCBs.com. I was very impressed with both the ordering and fulfillment process, as well as the boards themselves.
Reddit discussion here.