OpenEMR has a hidden module store that anyone can post their module to.
There is a modules page at the bottom of the https://open-emr.org page, but there is a page not shown to the public
You can only see this page if you install OpenEMR and go to the modules page. At the top is a link to this page.
The foundations have tried to encourage developers to share their modules upstream. The benefit if this page was public would be to show those who have discovered OpenEMR for the first time that the software is expandable and has ready made module like WordPress or Drupal.
While a formal module store is still up in the air. This is what we have for those who dare to share.