No matter where you're from or what you do for a living, thanks to the conveniences afforded to us by the internet, making money is no longer a constant and never-ending struggle. With the proverbial world at our fingertips, as long as you know how to tap into the vast amount of opportunities found in the digital ether of cyberspace, you can earn some extra income, even if you're in a tight bind.
I have been thinking of promoting livechat softwares like proprofs.com/chat/ it seems this can also be a good product to be sold as an affiliate product. Since most sites would be happy to implement such support tools on their sites. I am working on the roadmap to get started with it, BTW really big list of ideas you have shared. Will surely get some help from it.
Sometimes it seems like there’s an app for everything. Yet somehow, new ones keep popping up and selling for lots of money, all the time. If you spot a niche that hasn’t been filled to its potential just yet, and you can learn the coding skills (or know someone who already has them), you could be on to something with this side business idea. Today, it's even possible to build an app without any coding skills whatsoever. Just make sure you validate your app idea before jumping too far in. Even if your app business idea doesn't pan out to be a best-seller, you'll still pick up valuable skills.
I surprisingly get a lot of people asking to detail their car. I never intend to make a business of it, but I love doing it to my cars and people ask me to do it to theirs. All it takes is a cheap orbital buffer (mines a used craftsman) and a shop vac. I normally get easily $100 for a basic wash/wax/vac, or $200 to remove scratches and polish then wax the car.