http://code.org/ - Hour of code home. Teaches coding/programming.
http://www.codecademy.com/ - Interactive training in current programming languages.
http://www.appinventor.org/ - Teaches students to program apps for Android devices.
http://lightbot.com Fun intro to programming
http://www.admongo.gov/ - Adventures in advertising identification and meaning. Produced by the FTC.
http://memory.loc.gov/ammem/index.html - From the Library of Congress Collections of historical maps and documents.
Homework help and general interest:
http://bjpinchbeck.com/ - Site with links to numerous homework/research and help sites.
https://www.khanacademy.org/ - All the things Khan Academy
http://www.stratalogica.com/NystromDigital/home/home.html - Features map journeying, based on Google Earth.
https://geoguessr.com/ - Guessing where you are on the globe, based on google earth “street view” images. Points awarded for success.
https://www.ted.com/talks - All of TED talks
Drawing and Puzzles
http://www.zefrank.com/scribbler/gallery/index_ran.html Fun drawing tool. Turns crummy mouse-drawn doodles into webby, stringy, artistic looking sketches.
Scribbler 2 Fun drawing tool. Does the same sketchy, stringy thing on the fly.
http://www.sudoku.com Free to play and has tips and explanations
http://www.pleacher.com/mp/puzzles/igames.html Interactive puzzles and games
http://www.rinkworks.com/brainfood/p/math1.shtml Math-based puzzles
http://brainden.com/games.htm Brain games, chess, sudoku etc.
http://cryptograms.org/puzzles.php Collection of sites that offer traditional logic puzzles, word puzzles and math puzzles
Duolingo - Fun way to learn a language.
Apps that are OK