Wikia still exists... for example
https://googology.wikia.org/wiki/Googology_Wiki is a fun one to lose an afternoon to.
And you thought Graham's number was big...
> Graham's number is commonly celebrated as the largest number ever used in a serious mathematical proof, although much larger numbers have since claimed this title (such as TREE(3) and SCG(13)). The smallest Bowersism exceeding Graham's number is Corporal, and the smallest Saibianism exceeding Graham's number is Graatagold.