Great list! I have been a stay at home Mom for going on 4 years now. It is absolutely a sacrifice, both emotionally and financially to do so. I started looking into ways I could supplement our income, since my husband gets paid monthly. I do before/after school care most days, then during my free time I float between Amazon mturk and Swagbucks. Neither will make you rich quick.
If you’re a skilled worker in a specific niche, like marketing, design, or software development, there are specialty marketplaces that cater just to you. These are amazing places to make money online as you know that the people visiting them are looking specifically for the skills you have. Check out places like 99Designs or Dribbble for designers, Cloudpeeps for marketing and SEO professionals, and TopTal, Crew, or Gigster for high-level software developers. Once you've built up your development skills, you can begin building a brand for yourself as a higher-value consultant and start charging brands for larger projects like implementing an entire WordPress security overhaul or migrating a website from http to https.
I am a STAM working 3 jobs… all part time and from home… (can u believe it?) But really, I started with the mystery shopping, and that was OK. The positive was you get paid, the challenge was not frequently and sometimes needed to wait a month for payment to be transferred to the paypal account. Then I became and infant massage teacher and love this. REDTENTSALE is my Ebay store, I sell so many various items I find from wholesellers and it’s nice, I do this when the kids are asleep; anyone can… very manageable and nice “but light” income. I would say the one by far that is taking me places is Real Estate Marketing.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.