http://www.muonline.com/

http://www.falstad.com/scale/

http://t-o-m-e.net/main.php?tome_current=1
http://www.multiverse.net/
http://news.com.com/New+gateway+to+multiple+virtual+worlds/2100-1043_3-5983264.html?tag=nefd.lede
http://games.slashdot.org/article.pl?sid=05/12/06/186217&tid=209&tid=8

http://www.searchlores.org/schopeng.htm