The appeal of these passive income sources is that you can diversify across many small investments, rather than in a handful of large ones. When you invest directly in real estate, you have to commit a lot of capital to individual projects. When you invest in these crowdfunded investments, you can spread your money across many uncorrelated real estate ventures so individual investments don't cause significant issues.

Another source of income (or at least revenue) can be selling things you no longer use. When we go through our closets and drawers, I tend to find a lot I can do without. Some goes to Goodwill / Salvation army / Habitat Restore (tax deduction = income), some is resold on Amazon or eBay, some goes to the trash. I’m not sure if reselling something you paid more for should really count as income, but it’s money in the door, or less money out as is the case with donations.
That is a nice list of passive income sources. Actually, the most up-to-date list of dividend growth stocks is the list of dividend champions, maintained by Dave Fish. The list of dividend aristocrats is incomplete at best. For example, the dividend champions list has over 100 companies that have managed to increase dividends each year for at least 25 years in a row. The list of dividend aristocrats has no more than 50 – 60.

We had a very small interest income from our saving and reward checking accounts. The rate is low and I tend to invest rather than keep a lot of cash around. I also have some income from my P2P lending account at The ROI of my Prosper account is much better than the rate at my bank, around 8%. Lastly, we have some interest income from our bond funds, but these are all in our retirement account so they are not taxed at this time.
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And, let’s face it; not everyone wants to sling body wraps or nutrition shakes to their family and friends. That’s why offering a service is often one of the best, and least uncomfortable, ways to earn side income doing something you love. Maybe you want to clean houses or rake leaves or help people file their taxes. It’s totally up to you, and that’s the beauty of this option.