Free Rice – http://www.freerice.com – this site is an example of a “mash-up”; it combines 2 good ideas: expanding vocabulary and donating to a worthy cause at the same time!
KidsClick! – http://www.kidsclick.org – the advanced search includes searching by reading level
Spelling City – http://www.spellingcity.com – free online tool for reviewing spelling words in a variety of formats
Study Stack – http://www.studystack.com – use pre-existing word lists or create your own using this free online tool that transforms vocabulary words into a variety of fun and engaging activities
Study Jams – http://www.studyjams.com – Free animated videos and activities for math and science from Scholastic.
Thinkfinity – http://www.thinkfinity.com – this free resource offers excellent content, interactive tools, and printable study guides aligned to state standards
Literacy and Math Skill Builders – http://www.internet4classrooms.com/grade_level_help.htm – a variety of free tutorial resources organized by grade and skill.
SweetSearch – http://www.sweetsearch.com – provides a safe search tool with expert reviewed resources.
XtraMath – http://WWW.xtramath.org — provides a motivational platform for math skill reinforcement.
Quizlet – http://www.quizlet.com — a customizable program so you can create digital flashcards for your students. This works well with iPod Touch handheld units, laptops, and other devices.