http://www.spanishdict.com/guide/simple-future-regular-forms-and-tenses (NOTES - REGULAR)
http://www.spanishdict.com/topics/practice/94 (QUIZ)
http://www.spanishdict.com/guide/irregular-simple-future-forms (NOTES - IRREGULAR)
http://www.spanishdict.com/topics/practice/95 (QUIZ - including spelling changes)
http://users.ipfw.edu/jehle/courses/S210/FUTURE2.HTM (answers linked bottom left corner)
http://www.linguisticsgirl.com/simple-future-irregular-spanish-verbs/ (Notes with common variations of irregulars)