There are several ways in which you can earn free Smeet coins, including entering into any room with the word "coins" or "dimes" in the name. If you select any of the posters on the wall, it will enable a cheat and you'll earn free coins.
Yes there are. Many other fun ones! Smallworlds, Second life, movie star planet, smeet, habbo, habbo la, habplus, meez, webkinz, club penguin and many more! If you need anymore just search Virtual Worlds!