Another defunct site is Deletionpedia, which compiled articles that had been removed from Wikipedia for not meeting various criteria (usually relating to notability IIRC). The site is dead but the HN discussion lives on:

"Deletionpedia: Rescuing articles from Wikipedia's deletionism": https://news.ycombinator.com/item?id=31297057

I rather lament that Stupidedia is now defunct, way more entertaining

(https://www.stupidedia.org german only satirical wiki)