In terms of adding to your list, I also recommend careers in online marketing. Now, there are two types of careers. The first one, where you have to work out of an office, is not really making money purely online because it’s a job that requires an office presence (although an absolutely amazing one and one that may still make your list). However, another route is starting your own SEM agency. If you start your own agency, you can make a tremendous amount of money from the comfort of your own home if you work hard and are really good.
Ebay is a bellwether. It's been around since nearly the start of the online boom. But, like any other platform, success can seem fleeting if you don't know what you're doing. Selling items on eBay, professionally that is, can be an art form. Getting people interested in your auctions isn't always easy, especially when there's hefty competition and low demand for what you're selling.
Teaching and tutoring English as a second language is a great way to make money online, not to mention open some doors for you to travel the world if you'd like. While full ESL (English as a Second Language) accreditation is recommended, as long as you’re a native speaker and have the ability to teach, there are people in countries such as Hong Kong or the UAE who are willing to pay upwards of $25/hr for you to tutor them English via Skype. Check out Indeed, Learn4Good and Remote.co for remote english tutoring jobs or sign up on a specialized site like VerbalPlanet or Chegg Tutors.
Another way to utilize your talent and business skills is to run corporate workshops online. Businesses are always looking for unique ways to help educate their workforce, and if you can package your talents into a day or half-day long session, you can sell that to companies all over the world to make money online. Start by building a portfolio and then reaching out on LinkedIn to influencers at relevant companies to see if they would be interested in you teaching their team.
This is a browser extension you can install that will occasionally show you sponsored advertisements on your sidebar when you search. Each advertisement is worth a few cents or more. If you visit the ad shown, you receive the dollar amount shown in your Qmee virtual “piggy bank”. You can cash this out at anytime, there is no minimum. Also, the money shows up in your Paypal account pretty much instantly after you ask for it. I put this site on this list because even though it's not a big earner, you can get paid quickly.