Small correction: KGS is no longer Java-client-only. The protocol was opened up a few years ago and there are several web-based clients now, most notably https:

Small correction: KGS is no longer Java-client-only. The protocol was opened up a few years ago and there are several web-based clients now, most notably https://shin.gokgs.com/ https://shin.gokgs.com/ Also thank you for the lifein19x19.com shoutout :)