Scopus/Crossref Plugin for OJS 3.x : This plugin shows the total number of citations and a "cited by" article list from Scopus and/or Crossref.

OpenId plugin for OJS, OMP, OPS 3.x

Announcements Block Plugin for OJS 3

Most Viewed Articles Plugin for OJS 3.x: Show the most-viewed and downloaded articles on the journal's homepage

PKP Preservation Network Plugin

Twitter Block Plugin for OJS, OMP, OPS 3.x

(work in progress) Plugin for OJS 3.x for dynamic extension of metadata forms (submissions, supplementary files, authors) via json.

EXPERIMENTAL Plugin for OJS allowing you to add webhooks for certain events, such as new submissions, submission status change, or review confirmations, making it easier to integrate OJS with other systems

Plugin to OJS until 3.1.2.4, showing articles most read. This plugin isn't homologated by PKP, but is developed, and testes by AntSoft Systems On Demand

OJS 3.x plugin that displays an overview of all article metadata of a future issue.

Plugin for Open Journal Systems for author issue selection during submission. Editors configure available issues and pre-assign guest editors. Submissions are automatically scheduled and assigned to configured editors.