Proceedings is the flagship of the U.S. Naval Institute and provides an independent forum for discussion on professional topics of interest to the Sea Services. They publish book reviews (650 words maximum), and potential reviewers should send an email to the book review editor describing their writing experience and subjects they feel qualified to review. Apart from these, Proceedings also publishes feature articles and columns. Rates vary, and published non-members also receive a complimentary one-year membership in the Naval Institute. Details here.
JSTOR Daily is a publication focused on scholarly research and analysis. Their guidelines say, "We’re excited by stories that tease out the details or that look at the obvious in a non-obvious way. Subjects that are newsworthy, entertaining, quirky, surprising, and enlightening are right up our alley." According to payment reports, they pay an average of $0.31 per word. To learn more, read their submission guidelines.
133t is a startup that has streamlined the hiring process, making it completely automated." They have a career and employer related blog. They pay $50 per post. To learn more, read their submission guidelines.