The Crossref Reference Linking plugin (github source) used to be available in OJS 3.1.2. But doesn’t show up in my OJS 188.8.131.52 plugin gallery. Is there a reason for this? Is the plugin not compatible with the newer version?
Note: I run a local installation of OJS for testing purposes, and I haven’t given it a proper Crossref connection. But that shouldn’t prevent me from viewing the plugin in the gallery and installing it.