The site publishes free online games that you can play with your browser. “Igo Online” is a 19×19 Go, “Mini Go Online” is an irregular 9×9 Go, and “Uragaeshi Online” is an 8×8 Reversi. They have features such as matching games, watching games, rankings, edit, sharing URLs, and you can easily play without e-mail registration. Please see here
that are smartphone games.