Peter T.

I like wikipedia because you find information about pretty much anything. If you are a curious person and bored you can just go to wikipedia, go to a random article and learn something new. It might not be very practical, but it might help you think of something more interesting to do. Obviously its not a place to do scientific research, but the sources on articles can often times be quite valuable and help you find a more detailed source of information. Wikipedia is a great place to read biographies about real people. It can also be used as an unbiased news site.

Github is great, pretty much every coder in existence has heard about it and probably uses it. Great for saving code and sharing it. Downside is you have to pay a subscription if you want your code to be private.

It is a great place to book cheap flights. My experience with this provider was all pleasant. The prices were significantly lower. The customer services were very professionally handled, I was impressed.