Great website that curates longform nonfiction and fiction articles on just about every subject. I like using the random article button and learning about subjects I would normally never think about. They unfortunately don't update the website anymore but there is enough there already to last a lifetime.
Kind of unrelated, but it's a really cool "news aggregator". I've stumbled upon lot of interesting things (by this I mean videos, poems, articles and essays, not discounring the odd image) on here-interesting and quaint alike. These are especially useful when I have some sort of creative block.