Hello all,
You can play live Makruk on Playok:
http://www.playok.com/fr/makruk/

and live Chu Shogi (also Dai Shogi) here:
http://sdin.jp/en/browser/board/chushogi/

I've not found any website for Janggi liveplay. But there is turn-based Janggi at chessvariants.org and Dualpose.