The just-launched Open Access Button is a browser-based tool that lets users track when they are denied access to research, then search for alternative access to the article. The Open Access Button initiative hopes to create a worldwide map showing the impact of denied access to research.
To get the Open Access Button: https://www.openaccessbutton.org/#top
Whenever a user encounters a paywall, he/she clicks the button in the bookmark bar, fills out an optional dialogue box, and the experience is added to a map. Then, the user receives a link to search for free access to the article using resources such as Google Scholar.