Homonyms, Homophones and Homographs - Explains the differences between these types of words. Includes worksheets and resources. [Worksheets require Adobe reader.] - http://www.firstschoolyears.com/literacy/word/other/homonyms/homonyms.htm
Homophones Sentence Completion - Test your understanding of words which sound the same as each other by dragging and dropping them into sentences. - http://quizhub.com/quiz/f-homophones.cfm
Quia: A Feast of Homonyms - A matching game of homonyms. Includes match, concentration, flashcards, and word search. - http://www.quia.com/jg/66106.html
Word Study Skills: Homonyms - Description, pictures, and interactive homophone practice. - http://www.manatee.k12.fl.us/sites/elementary/palmasola/ps4glehomy.htm
FunBrain: Word Confusion - Choose the correct homonym to finish the question. Features easy and hard sections. - http://www.funbrain.com/whichword/
Allan Cooper's Homonym List - A long list of homonyms arranged in alphabetical order. - http://www.cooper.com/alan/homonym_list.html