Occupational therapist Sarah Stromsdorfer founded occupational therapy site MyOTSpot.com three years ago as an online educational resources for occupational therapy students and professionals. She worked on it every weekend, and her site now makes enough income for her to work as an occupational therapist part-time. She believes it will be another year before her site makes enough money for a full-time living of about $4,000 per month. In addition to the digital products she also makes money from ads and online book sales.

Writing an e-book is very popular among bloggers, as many have noted that “it's just a bunch of blog posts put together!” You will not only have to make an investment of time and energy to create the e-book, but market it correctly. However, if marketed correctly (through blogging affiliates in your niche, for example), you could have residual sales that last a very long time.

Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
In which socio-economic neighborhoods do you want to buy? I know real estate investors that have done very well buying and renting in lower-income neighborhoods. For me, it was a huge mistake. I fell into the trap of thinking, “I can buy a house for about half the cost as what I would pay in a better neighborhood.Even if I get slightly lower rent, say 70% as much, I’m still making a higher return.”Wrong!The money you lose on tenant turnover, unpaid rent and repairs far outweighs any benefit to buying property at a discount. Now, I always recommend to investors to never buy a house somewhere they wouldn’t want to live. If the business does poorly, you may end up living in one of your homes.
However, I think for those who are willing to do what it takes, the sky is the absolute limit. As an example, I’m trying to take a page out of FinancialSamauri’s book and create an online personal finance and investing blog. It is an enormous undertaking, and as a new blogger, there is a seemingly endless amount of work to be done. That said, I hope that one day I can not only generate some passive income from the hours of work I have put and will put into the project, but I hope to be able to help OTHERS reach their financial goals.
Flynn has created many different products. While his LEED exam is what got him started, he has both earned a commission from selling other people’s products and offered a commission to others who would sell his wares, and also recently created his first software, SmartPodcastPlayer.com, after realizing that most online podcast players offered only the basic stop/start/volume features. He hired a development team to create a superior one, which was a success from day 1. “We sold out 250 beta licenses in less than 24 hours, because I was addressing a need but also, I had built up an audience and trust with them … When you build that amount of trust with your audience, whatever you come out with, they will love.”
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What if there was a way for you to effectively make money while you sleep? Sounds like a dream come true, right? Even for the biggest workaholics, there are only so many hours in a day. If only you could get paid multiple times for something you did once—that’s exactly how passive income works! Thanks to technology, the potential to create multiple income streams is even easier than ever before. We’re no longer held back by the limitations of a traditional 9-to-5 job, and financial freedom is at our fingertips. Even if you already work a full-time job you can still improve your financial health with passive income. 

Book sales ($36,000 a year): Sales of How to Engineer Your Layoff" continue to be steady. I expect book sales to rise once the economy starts to soften and people get more nervous about their jobs. It's always best to be ahead of the curve when it comes to a layoff by negotiating first. Further, if you are planning to quit your job, then there is no downside in trying to engineer your layoff so you can get WARN Act pay for several months, a severance check, deferred compensation, and healthcare.

Betterment – Betterment was the first robo-advisor to launch, almost ten years ago. They’ve automated the entire investing process, so all you have to do is watch your portfolio of assets grow (over the long run, of course). They do charge a .25% annual fee of your account total, so if you’ve got $100,000 that’s being managed by Betterment, you’ll pay just over $20 per month.
Given the growth in the sharing economy, your junk can start to pay for itself. For example, if you have some awesome vintage furniture inherited from your grandmother sitting in a storage unit, you can rent this out to photographers for their “styled shoots” which are becoming all the rage. If your furniture is more modern but you still can’t bear to get rid of it – perhaps a home stager will be interested.
* I use Personal Capital to track all my finances in one place. It’s much easier to use their free software to follow 28 accounts on one platform than to log into various accounts to check my balances. They’ve also got great tools for x-raying your portfolio for excessive fees, recommending a more optimized asset allocation, and planning for retirement with their Retirement Planner.