Details on this: This is a restyled version of wikipedia content that looks a lot better. They have a browser extension that redirects you to the wikiwand version of the same page, which is the same content with much nicer formatting. It really looks quite a bit better.
Caveats: you have to trust a non-wikipedia site to keep their copy up to date, not to info-mine you, and if you quickly send someone a link, they may not realize they're still sort of on wikipedia.
For comparison: