What are some passive ways to make money online?

If you are planning on starting a company and are looking for some ways to earn capital on the side, then we are in the same boat.

I've written off doing freelance work as it's highly competitive and requires a lot of networking to find work. I've been there done that - not worth it.

I'm looking for an automated way to earn money online - I can code rails apps/websites quickly so ideally I'd like to use that skill and create a money maker.

Let's discuss...