The new project parameter - Visibility
For some extensions, you want to have an update server and a changelog URL, manage versions, but you don't want to show these extensions in the frontend so that visitors to your site can download and install them themselves. For example, these may be extensions that are installed as dependencies for other extensions, but at the same time have their own separate update server.
For such cases, you can set the visibility of the project: it can be hidden and the site visitor will not see it in the frontend, search engines will not index it and will not know about the extension page. But your clients' websites will be able to download updates. The visible column has been added to the project table in the database, which is 1 by default.