Language Arts:
Starfall - Books, movies, and games
Turtle Diary - Games to practice a varity of Language Arts skills
Vocabulary / Spelling City - Practice building vocabulary and spelling skills
Math:
Math Before Bedtime - Build number sense
Math Playground - Games to practice a varity of math skills
Splash Math - Games to practice a varity of math skills
Miscellaneous:
Free Rice - Practice various skills throughout subject areas AND help feed people in need!