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Just use the "Trakt List" and select one of the pre-populated list types under the drop-down "List Type" - you have 11 different views of popular / current / trending movies to choose from..... likewise you can do the same with the pre-populated IMDB lists.
I too was on a mission to find some mystical external lists, but then realised the trakt options are actually pretty good.
Apologies if you specifically meant other than the above, but it wasn't clear if you'd tried these first?