http://www.filleritem.com/ - Finds filler items for Amazon so you have enough to get free shipping.
http://sleepyti.me - tells you when you should go to bed/wake up for optimal sleep
Visualizing data - helps you understand the internet as well as the size of data.
charitynavigator.org - Site dedicated to reviewing charities so you can easily research any you might be interested in and see how they hold up.
noexcuselist.com/everything - A convenient list of lots of awesome sites to learn from.
Zen Habits - all about mindfulness and simplicity
fuckinghomepage.com - interesting and insightful links delivered with a lot of profanity
geoguessr.com - guess the spot on a map based on a google street view picture
justinguitar.com - learn guitar
http://www.whatshouldireadnext.com/search - Gives you book suggestions based on books you’ve liked before.
http://www.rememberthemilk.com — to-dos and remembering tasks.
mathrun.net - Practice your basic math skills with a simple game
nerdfitness.com - stay in shape the nerdy way
http://colorschemedesigner.com/ - useful for website color schemes
lettersofnote.com - letters written by famous people
khanacadmy.org - video lessons on everything
ninite.com - downloads of the best free computer apps available
http://unplugthetv.com/ - educational alternatives to television
sprocle.com - a trivia quiz website about everything
theuselessweb.com - find a random useless website
http://www.nophonetrees.com/ - Get directly in touch with a human when you’re calling customer service/support.
essaytyper.com - Don’t use this for actual essays
inbflat.com - This site is amazing
Freerice.com - helping end hunger and your memory
https://www.coursera.org/ - Online courses for free.
cookingforengineers.com - A site containing one man’s explorations in food, with step by step instructions for making a wide variety of dishes.
MIT Open Courseware - Free access to quite a few MIT courses that are on par with what you’d expect from MIT.
codecademy.com - Pretty nice website with introductory courses for various programming languages and web technologies.
investopedia.com - Learn about the world of finance, from basic terminology to in depth analysis of various areas of investing.
udacity.com - Free courses mainly focused around mathematics and programming.
zooniverse.org - Take part in investigating various interesting studies of nature, science, and culture.
livemocha.com - Community dedicated to the idea of everyone being fluent in multiple languages, teach or be taught another language with the goal of conversational fluency.
simplesciencefitness.com - Breaking down the science behind fitness into layman’s terms.
mailinator.com - free disposable email account
zamzar.com - online file conversion
http://www.printfriendly.com - Makes any page printer-friendly.
http://www.bugmenot.com - Usernames/passwords for sites requiring registration.
http://www.ovguide.com - Search engine for movies/tv shows.
http://www.scribd.com - Ebook search.
http://downforeveryoneorjustme.com/ - self-explanatory.
http://studyblue.com - Great site to get notes/past exams for college students.
http://mp3cut.net/ - Cutting/splitting mp3s.
http://ceevee.com/ - Build/maintain a resume.
http://www.cutmypic.com/ - Crop a picture.
http://www.doihaveadeadpixel.com/ - Do I Have A Dead Pixel?