Most major publishers in the sciences and humanities are transitioning from business models based on paid subscriptions to open access models that make their journals free to everyone. Instead of charging readers, they charge an author an article processing charge (APC) for publishing in a journal. Increasingly, universities are negotiating transformative (a.k.a. read & publish) agreements with these publishers that pay the APCs for researchers affiliated with their institutions.
The University Libraries has signed multiple transformative agreements, which are summarized in the comparative chart below. For more details, see the list of publishers listed on the left under the "Agreements with Publishers" heading (click on the chart to enlarge it).
Follow the flowchart below to see which option is best for you (click on the chart to enlarge it).