fabpide2 is a PCB kit that breaks out Stand-alone USB PD sink controller STUSB4500 by STMicroelectronics.
You can buy this kit from tindie.
See my blog post for a bit of background.
Please see the comments in the arduino flasher.
Is this open source?
Not yet as I need to clean things up quite a bit. Once done, I will include all the design files in KiCad as well as ready to manufacture gerber files.