Webtoons with at least a 9.5 rating (and a minimum of 100 votes) that aren’t otherwise classified as shoujo, josei, shounen, or seinen.
Subject to change as ratings change.
Part 2:
https://www.mangago.me/home/mangalist/2437772/Side List (9.4 to 9.5 Webtoons):
https://www.mangago.me/home/mangalist/3230674/ Other 9.5+ lists:
https://www.mangago.me/home/mangalist/2444195/ 
Messages