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Updated 2022:Libkey Nomad is now paired with Retraction Watch to indicate retracted articles.
LibKey Nomad automatically provides instant links to full text content for article subscribed to by your library - or open access alternatives (powered by Unpaywall). Nomad works across thousands of publisher websites and in Web of Science, PubMed, and Wikipedia and is currently available in Chrome, Firefox, Edge, Brave, and Vivaldi.
This plugin indicates PubPeer comments wherever they appear. A lightweight plugin to install and forget about. You will only notice that the plugin exists when it alerts you that an article has comments on PubPeer. PubPeer can also mark retraction articles.
Chrome & Firefox extension to find available versions of a published article. Unpaywall is run by Impactstory, a nonprofit dedicated to making scholarship more accessible to everyone. Open is our passion. So it's only natural our source code is open, too.