Writer's Research Group pays $15 per article and you choose your topics from a list of available titles. They do have a non-compete clause that excludes you writing for some other sites. However, I personally know several writers who are very happy here. If you are looking for a steady income, Writer's Research Group could be a good choice.
From the website:
"Writers provide material for one or more of a variety of nonfiction and technical projects, including technical manuals, training or instructional manuals, nonfiction books, literary criticisms, academic reference materials, directory listings, and web pages."
You'll need a resume to apply. If you need help creating a freelance writing resume, click HERE to view my help post. Good luck!