interoperable-europe.ec.europa.eu
In short: Getting listed on Interoperable Europe / Joinup Solutions is free. Plan for a few hours — it wants written material and a decision you do not control.
What they ask for: Publish a mature open-source interoperability or public-administration solution with documentation, releases, licence, and owner metadata.
Publish a mature open-source interoperability or public-administration solution with documentation, releases, licence, and owner metadata.
Only appropriate for genuine reusable digital-government value; account, eligibility, and editorial review apply.
Open the submission page on interoperable-europe.ec.europa.eu and complete its form — that is the "Open submit page" link at the top of this page.
Only appropriate for genuine reusable digital-government value; account, eligibility, and editorial review apply.
Priority sets the band — this one is medium. Cost (free) and effort (involved) move it within that band, which puts it in the useful tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.