You can mine GRR (1% fees) on:

stratum+tcp://fr.pools4mining.com:2291
stratum+tcp://us.pools4mining.com:2291
stratum+tcp://asia-sg.pools4mining.com:2291
stratum+tcp://pools4mining.com:2291

https://pools4mining.com/#GRRSOLO/connect

pools4mining.com has just launched a Smartnode to support the project.