Marvelous Entertainment have launched a free web version of their popular Harvest Moon Series. Called Minna de Bokujo Monogatari (Harvest Moon With Everyone) the game is currently available in Japan.
There are many similarities to FarmVille, from the way it looks to the way resources are gathered and players can help others; premium items can also be bought for money. However, players give orders to multiple assistants instead of one avatar, space is limited and there is no social network integration.
Source: 1UP