You can play Nikakudori, the simple mahjong-tile puzzle for free.(No plug-in, No download)
https://freemahjong.io
http://www.mahjonggmahjongg.com/
https://freemahjong.io
http://www.okmahjong.com/
playmaker
https://www.mahjong.bz
https://www.worldofonlinegames.com
http://wellgames.com/
https://mahjongo.com/
