Unpaywall is a free web browser extension, presently available for Chrome and Firefox, which quickly finds free and legal versions of paywalled research papers.  As you search for articles online, an “open lock” tab will instantly appear on the right side of your browser for articles where an open access version is available.  Click the tab to reach the full text.  More information?  Check out UnPaywall’s FAQ.

Post contributed by Judy Rabinowitz