Just some great websites...

https://openstaxcollege.org/students is an awesome website that lets you view or download Creative Commons licensed college text books. It is completely free and legal, and is actually partially funded by the Bill & Melinda Gates Foundation.

http://asoftmurmur.com lets you adjust the levels of different sounds (rain, thunder, fire, etc.) to make the perfect ambiance.

https://codeclippet.com is a great alternative to Pastebin, it has a focus on organizing useful bits of code snippets (Public or Private), lets you have notes on the side and uses a folder/ file structure. It also has a focus on the community with the idea of sharing useful bits of working code. You could even use it for just storing notes as well...

http://darebee.com (formerly neilarey.com) is a fitness and overall healthiness website that is completely ad and product-placement free. It provides you with visuals of workouts, free meal guides, and even with easy recipes.

http://tabletopaudio.com was created by a musical composer who creates 10 minute songs and ambiances originally for table top RPGs. However they are great to set a mood, get creatively inspired, or just chill to. And all the tracks are free to download!

https://www.citethisforme.com is probably the easiest way to cite books, websites, newspapers, etc. Just type in the name of the work and it does the rest. There is a premium version but I have only used the free version. I only wish I had this when I was in highschool.

https://alternativeto.net lets you find alternative software to any program. Just type in the name and find alternatives.

https://duolingo.com is an excellent website for learning new languages. It is very intuitive and easy. You can make a profile to save your progress for free.

https://librivox.org lets you stream or download thousands of free public domain audio books, read by a community of volunteers. Since they are read by volunteers some aren’t the best but there are tons of excellent readers.

https://archive.org is for everything public domain; books, movies; TV shows, music, games. If it's public domain, it's here.

http://gutenberg.org has thousands of free e-books free to read or download in many different formats (e-pub, HTML, kindle, etc.)

http://flixfindr.com lets you to browse through a never ending scroll of movies from all of your subscription services (Amzon, Netflix, Hulu, Xfinity, HBO GO) simultaneously. <-- Sadly this only shows movies and not TV series -->

https://www.codecademy.com/ A great place to learn to code with a range of different technologies and allows you to test your skills by following a tutorial which gets you to create small but useful programs, great for competitive people as well!

http://mailinator.com/
Signing up for a site but don't want to give them you're email without getting spammed? Mailinator gives you a disposable email meaning that it's deleted a few hours after it's closed.

http://ninite.com/ Ninite puts a package of software you choose into one and installs it all for you.

http://colorschemedesigner.com/ If you're designing a web page or anything that you'd like to have colour this tool is great. Select the colour you would like primarily and it'll find colours that go with it.