Oxford University Press, Stanford University's HighWire and Truman State University Pickler Memorial Library's free database all offer scholarly journal articles for free. The journals cover a variety of topics, including microbiology, entomology, neurophsycopharmacology and cybersecurity. Pickler Memorial Library even has collections of early journals from the 18th and 19th centuries.
Oxford University Press and HighWire both have search engines that enable users to search journals by topic or author. Some of the journals provide access to their most recent issues, whereas others only offer free back issues or free trial periods. Articles that require payment or a special account may stand alongside free articles.