Some others not listed are the Shi'ar's Imperial Guard (from X-MEN 107 and 108, by Claremont/Cockrum, and the first Claremont/Byrne issue) that are in all but name DC's Legion of Superheroes.
https://viewcomiconline.com/uncanny-x-men-1963-issue-107/And also in AVENGERS 141-150 by Englehart/Perez), introducing the Squadron Supreme, that are in all but name DC's Justice League.
https://viewcomiconline.com/avengers-v1-141/Both being unofficial Marvel/DC crossover stories, and a heck of a lot of fun.
Plus several others from the 1970-1973 period I can' recall offhand.
