Bitcoin Gold is a new hard fork planned by Jack Liao (CEO of LightningASIC), that will happen on October 25. It's main aim is to decentralize mining by changing the Proof-of-Work algorithm to ZCash's Equihash algorithm, and they promise it'll switch to a different PoW when ASICs are launched.

Its addresses will start with G (P2PKH) or A (P2SH), and it has replay protection. _Source

The official website is bitcoingold.org

Also These can be used to contact them:

• https://github.com/BTCGPU/BTCGPU
• https://twitter.com/btcgpu