This is a tiny ESP8266 breakout board. I made it because the small breakouts I bought took up the entire breadboard and didn't include basic pullup/pulldown resistors.
If you just want to buy the PCB directly, here's a paneled v1.4 version from Dirty PCBs, which includes 40 breakouts for $14.
Use it however you want, it's under the BSD license, here's what it looks like:
The files are standard KiCad files, go nuts.
Stavros