What other passive methods do you guys have?

Looking for more passive income earnings with apps/sites. Already all of this subreddits recommendations that are listed by the site itself. Does anyone have any unknown gems i can look into?

submitted by /u/NachMitternacht
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source https://www.reddit.com/r/beermoney/comments/1f8lu28/what_other_passive_methods_do_you_guys_have/