We’ve removed from the Add-ons Catalog the references to those add-ons that were not active in the last few years, as well as those who were only tested in quite old versions of OpenNebula.
Please, let us know if there’s anything else you are actually using in your OpenNebula environments and is now missing from that list! Inactive repos for those old add-ons will be archived when we release version 7.0 later this year.