http://quizhub.com/quiz/f-spelling.cfm
http://www.bbc.co.uk/education/dynamo/den/spelling/index.htm
http://www.ictgames.com/lcwc.html
http://www.funbrain.com/cgi-bin/sc.cgi?A1=s&A2=1
http://school.elps.k12.mi.us/donley/classrooms/berry/sitton_spelling_activities/1stgrade_spelling/core_word_units.htm (first grade spelling unit)