As far as we know, WebGPIO and WebI2C are implemented by CHIRIMEN Open Hardware Community.
There are native implementations for B2G, polyfill implementations for Raspbian, and implementations via WebBluetooth.
- CHIRMEN for Raspberry Pi3
- CHIRIMEN with micro:bit
- CHIRIMEN for TY51822r3
- CHIRIMEN for B2G board computer CMN2015_1
Please contact us if you have any other implementations.