Ask HN: Best passive income method for a solo developer?

Datetime:2016-08-22 22:37:53          Topic: Coder           Share

I'd consider myself a pretty experienced developer with diverse skills. I want to create some passive income streams using my abilities.

What are the recommended methods for a solo developer? Which method of the following would you recommend?

ebook in a niche technical topic
    SaaS product that solves a niche issue 
    mobile or web based game

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