The online article marketplace Constant Content allows freelance writers and other content producers to do a couple of things.
1. Post articles for sale. You can even set your prices based upon the license level (publish, unique, or full). This is all explained on the website.
2. Respond to requests for articles from buyers. They will post requirements and prices they want to pay.
Does everybody make money on Contstant Content? No. According to feedback, the return you get is based upon how you respond to the market and the quality of your work. Some people are very satisfied, and they end up with clients who order from them again and again. Others do not sell anything or get their articles rejected by quality control.
My advice is to browse around the site and see if it looks interesting to you.
Besides articles, they also take drawings, photos, and videos!