What are the best puzzle websites?
This question is subjective, but I'd like to know what other people think. There are lots of puzzle websites, some great, some not so great. I know about (and like) XKCD Puzzles, and, of course, Puzzling.SE.
Name 1 or 2 or 3 that you like to use or that you use often. I want to read through lots of data of people's opinions on this to widen my puzzle base. Feel free to add explanations or anything you have found. Or if there are great sources for puzzles that are not online, mention those as well.
Finally, would this question be better on the actual Puzzling.SE website, rather than the meta site, since technically, the meta site is for talking about the actual site, and not so much for general questions?